Mercedes-Benz GLB-Class vs BMW X3

What's the difference?

It’s easy to say the GLB35 doesn’t deserve to be called an AMG when looking at its credentials on paper, but get behind the wheel and it’s evident Affalterbach played a key role in making it feel as special to drive as it should be.

The GLB35 has all of the great qualities of the GLB250 and other GLB variants, but successfully adds a performance focus to make for an even more compelling package.

Indeed, the GLB35 proves you can pretty much have it all.

The X3 xDrive30e is a sporty SUV with fantastic ride quality and slick driving characteristics, although its specs seem a bit behind on the electrified front despite it being the most expensive PHEV of its peers.

This leaves it with an odd split personality of being particularly limited to tight city driving to make the most of its EV features, while its engaging nature beckons more to the open road than some of its rivals. A jack of two worlds perhaps, but a master of neither.

With the boxy and therefore rugged-looking GLB laying some great foundations, it’s no surprise the GLB35 looks pretty damn good – to these eyes, at least.

Being an AMG model, it stands out from the crowd with an aggressive body kit, with the chunky bumpers, aerodynamic roof spoiler and racy rear diffuser all unique alongside the now-signature Panamericana grille insert.

A set of 20-inch alloy wheels with 255/40 tyres ups the ante at the side, where the carryover black plastic wheel-arch and skirt cladding serves as an obligatory reminder that this is an SUV.

Also of note are the nicely designed LED headlights and tail-lights, which literally light the way, but there’s no getting past the bespoke diffuser element, which integrates the sports exhaust system’s dual 90mm tailpipes.

Inside, the GLB35 is a technological tour de force, with a pair of 10.25-inch high-resolution displays proudly sitting side by side atop the dashboard, with one the central touchscreen and the other the digital instrument cluster.

Both are powered by Mercedes-Benz’s MBUX multimedia system, which arguably remains the best there is today thanks its speed and breadth of functionality and input methods.

The GLB35 is also properly premium. Lugano leather upholstery covers the seats and armrests, while Nappa trims the sports steering wheel. Even the door shoulders and inserts get ‘cow hide’, although theirs is of the artificial variety.

Soft-touch materials are used for the upper dashboard, leaving hard plastics to the lower sections, which is what you’d expect for the price.

While the black headliner makes for a dark cabin, brightness comes from the metallic trim used throughout, notably on the steering wheel, dashboard, doors and centre console. And let’s not forget the pop of colour provided by the addictive ambient lighting.

And mercifully, scratch- and fingerprint-hungry gloss-black accents are limited to the surrounds of the turbine-style front air vents, dual-zone climate controls and centre console.

Unique to the GLB35 are Carbon Structure trim and stainless-steel sports pedals, just in case you forgot you weren’t driving a regular GLB.

The X3 is iconic BMW, having come to be the face of the brand for many buyers, the mid-size SUV exemplifies the Bavarian marque’s ‘kidney grille’, sharp and tall lines, and strongly defined body.

It’s part dainty luxury car and part buff Germanic tourer in equal measure. Suffice it to say fans of the brand will love it, but it’s not going to make converts of anyone else.

Newer design elements which adorn the X3’s body include the striking tail-light design, and little plastic fills below which combine with its contrast bumper and dual-exhaust ports to make for a sporty looking SUV.

The wheels look enormous and add enough chrome to the picture to keep it looking sleek, while subtle badgework has always been a hallmark of a good BMW.

BMWs have always had a relatively minimalist take on the interior design, and overall this is a space in which progress has been made at a glacial pace throughout the brand’s history, wild 7 Series limos being the exception to the rule.

This means the X3 gets the iconic centre-panel, ever so slightly oriented to the driver which houses the two centre air vents and climate control buttons, and a small panel below which houses the volume knob and shortcuts for the radio.

The digital revolution has very much come to the interior of this SUV though, as the top of the dash is adorned with a single enormous panel, and a second one set in the instrument binnacle in a classic fashion. It will all be quite familiar, even if you’ve skipped a BMW generation or two.

The wheel is a key touchpoint, clad in a lovely soft padded leather but with a chunky three-spoke design and massive notches at 10 and two for you to rest your hands on.

I don’t like this wheel in the brand’s more dainty sports cars like the Z4 where it feels too big, but it definitely feels at home in the X3.

Quality materials with plenty of soft-touch plastics and leather trims extend their way into the door, while the software is appealing in its design and fast to respond; clearly backed by strong hardware.

A final thing worth noting is the X3 has one of the more dated interiors in the BMW range. While it has been augmented with digital upgrades over the years, it doesn’t feel as contemporary as the incoming range of cars with the next-gen design elements. Take a look at the iX’s spectacular interior for what you’re missing out on.

Measuring 4650mm long (with a 2829mm wheelbase), 1845mm wide and 1660mm tall, the GLB35 is more like the GLC43 in size than the GLA35, making it a mid-size SUV despite its small underpinnings. And that is good news for practicality.

Cargo capacity with the 50/50 split-fold third row stowed is more than solid, at 565 litres (VDA), but it can be increased to a cavernous 1800L with the 40/20/40 split-fold middle bench also not in use. If six or seven passengers are onboard, though, there’s very little room to move.

Nonetheless, the boot is still well packaged, featuring a huge aperture, no load lip, and a flat floor, which make loading and unloading bulkier items a hell of a lot easier. And even the load cover can be stored underfloor when out of action. How good.

There are also four tie-down points, two bag hooks, a side storage net and a 12V power outlet on hand to make matters even easier, while the rear seats can be stowed from the boot.

While we’re on the topic, Mercedes-Benz says the third row can accommodate passengers up to 168cm tall, with the middle bench able to slide fore and aft by up to 140mm.

Yes, I'm too tall, at 184cm, but I can still sit in the very back, although not in total comfort. All in all, about a centimetre of legroom and negligible headroom and toe-room are on offer there for me.

That said, getting in and out in the first place is the real challenge here, with the middle bench unable to tumble forward for easy ingress and egress. Yep, you’re not going to look smooth either way. Children can deal with it, but adults won’t be thrilled.

Therefore, the middle bench is the place to be, even when it’s slid all the way forward. Behind my driving position, it offers about a centimetre of legroom, but this can be increased to several inches by sliding it all the way back.

Either way, plenty of toe-room is available alongside more than an inch of headroom. The latter is more impressive when you consider that’s what you get with the standard dual-pane panoramic sunroof fitted.

Even better, the second row can seat three adults at a pinch, partly thanks to the low transmission tunnel, which means there’s the right amount of space for six fully grown feet across the two footwells. It goes without saying children will again be fine.

Speaking of which, four ISOFIX and five top-tether anchorage points are on hand for fitting up to four child seats across the second and third rows, which makes the GLB35 a serious option for families that like to be sporty.

There are plenty of in-cabin storage options, with the large central storage bin featuring a pair of USB-C ports, while the glovebox is also quite useful, even if it is oddly shaped. And there’s also a sunglasses holder in front of the rearview mirror.

The centre console’s cubby isn’t really designed for storage, with it basically taken up by two cupholders, another USB-C port and a wireless smartphone charger.

The front door bins can accommodate one small and two regular bottles each, which is great, while their rear counterparts can take one small and one regular apiece.

Second-row occupants also have access to a fold-down armrest with another pair of cupholders, but being of the retractable variety, they’re flimsy.

These passengers also have two USB-C ports, with the pair folding out below a small cubby and air vents, which are found at the back of the centre console. Storage nets are also fitted on the front seat backrests.

And don’t worry; the third row gets in on the action, with two cupholders (one regular, the other small) splitting the seats, which have individual USB-C ports and device straps to the sides.
 

The X3 is reasonably large on the inside, with a commanding road view and healthy space for an adult in both front seats. The tall roofline leaves plenty of room for someone my 182cm height, while leather-clad soft-touch finishes are present for your elbows and knees.

There’s a large bottle holder and thin bin in each of the front doors, and a wide centre console with a further two bottle holders with adjustable ridges and a large storage bay suitable for a phone below the climate cluster.

This area also houses a USB port and a little shaped notch for you to place the key, and the whole area can be covered over with a retracting lid.

Like all BMWs there are well hidden shortcut buttons for many of the functions which integrate into the design, and there’s a multimedia screen function for most functions, too, controlled through the centre dial system, or via touch.

It’s nice to have both, unlike some Mazdas which use a similar control system, but force you to rely on the dial.

The second row looks a bit flat from a distance, but you do sink into the leather-clad seats nicely, and unlike some rivals in this category, the second row is fixed and not on rails.

Room for a 182cm tall adult is decent, with a little more than adequate knee room and excellent headroom.

The leather trims continue, and true to the sense of being a premium brand the intruding piece of wheelarch is also clad in padded leather. No touching plastic in here.

A single bottle holder appears in each of the rear doors, with a further two in the drop-down armrest, and there’s a netted pocket on the back of each of the front seats.

Rear passengers get their own climate zone with an independent control panel as well as a 12V outlet and two USB-C ports.

Luggage capacity in the boot is rated at 450-litres (VDA), significantly down on the combustion versions of this car. Note in the pictures the stepped boot floor, which is adorned with a chrome trim piece for some reason, as though the car is always reminding you of the lost room.

Still, the squared-off space managed to fit our three-piece CarsGuide luggage set with relative ease and room to spare. There is a thin and narrow slot under the boot floor which serves as a location to place your charging cables.

This plug-in version of the X3 sits near the top of the X3 range, eclipsed only by the M40i performance variant and the fully-electric iX3. This means a starting price of $104,900, which initially doesn’t bode too well for the BMW given its rivals can be had at a lower price.

The similarly-specified Mercedes-Benz GLC 300e starts from $95,700, the Volvo XC60 Recharge starts from $97,990, and the impressively-specified newcomer on the block, the Lexus NX450h+ is the best value of the lot at just $89,900.

You’ll note all of those plug-in models are of the higher specification in their respective ranges, with each manufacturer clearly trying to draw buyers into this tough-to-understand tech by compensating the curious with gear which would otherwise be optional on a pure combustion car.

There are technical elements which play into the value of each when it comes to the PHEV drivetrain which we’ll look at later in this review (it’s particularly important when it comes to how you use and park your car) but we can at least say the X3 xDrive30e comes with a healthy amount of equipment.

Most of this matches the xDrive 30d below it, including large 20-inch alloy wheels, a set of M sport trims, brakes, and adaptive suspension, 'Vernasca’ leather interior trim, adaptive LED headlights and LED tail-lights, ambient interior lighting, a 12.3-inch multimedia touchscreen with wireless Apple CarPlay and Android Auto connectivity and built-in navigation, a second 12.3-inch screen for the ‘Live Cockpit’ digital instrument cluster, tri-zone climate control, a head-up display, electrical adjust for the driver and front passenger seats, a 12-speaker sound system, and the functionality for over-the-air updates.

The specific inclusions for the xDrive30e include free optional paint colours, a panoramic sunroof, lumbar support in the driver’s seat, front seat heating, wall socket to Type 2 and Type 2 to Type 2 public charging cables, and specific i-branded interior elements.

Normally the sunroof and premium paint are part of a $5400 option pack, while the heated seats, steering wheel, and lumbar support seats are normally a $1200 option, meaning the PHEV variant only leaves you $3400 and a set of ‘Laserlight’ LED headlights worse-off than if you were to apply the same options to the xDrive30d.

Not bad considering it also packs a 12kWh Lithium battery under the boot floor, and a secondary electric motor integrated into its transmission. More on this later.

The GLB35 is powered by an uprated version of the GLB250’s 2.0-litre turbo-petrol four-cylinder petrol engine, with the AMG-fettled version producing a more substantial 225kW of power from 5800-6100rpm and 400Nm of torque from 3000-4000rpm (up from 165kW/350Nm).

This version is also matched to an eight-speed dual-clutch automatic transmission as well as Mercedes-AMG’s front-biased but fully variable 4Matic all-wheel-drive system.

Thanks to this combination, the GLB35 can sprint from 0-100km/h in just 5.2 seconds with launch control enabled, while its electronically limited top speed is 250km/h.

The PHEV version of the X3 pairs the brand’s usual 2.0-litre four-cylinder turbocharged petrol engine with a relatively powerful electric motor integrated into its eight-speed torque converter automatic transmission.

On its own, the engine produces 135kW/300Nm, while the electric motor is capable of punching out 80kW/265Nm. When working together, the EV components can provide a further electrified boost, for a total of 215kW/420Nm, allowing for a 0-100km/h sprint time of 6.1 seconds. This makes the 30e only slower than the M40i and 30d variants in the rest of the X3 range.

The xDrive30e is capable of travelling up to 135km/h under electric power alone, with a surprisingly small 12kWh battery delivering around 41km of pure EV range.

As the electric motor is mounted in the transmission it is capable of driving all four wheels via the brand’s 'xDrive' system with torque vectoring.

Somewhat amusingly, the German documentation for the X3 includes a section for “off road characteristics” (I suppose it is an SUV after all…) and for those interested the xDrive30e can ford at up to 500mm depth, has an approach angle of 25.6 degrees, a departure angle of 22.8 degrees, a breakover angle of 20.0 degrees and a ground clearance of 204mm. Enjoy the trails.

The GLB35’s fuel consumption on the combined-cycle test (ADR 81/02) is 8.3L per 100km, while its carbon dioxide emissions are 186 grams per km. All things considered, both claims are pretty decent.

In our real-world testing, though, we averaged a high 14.1L/100km over 75km of driving split between highways and country roads, so not your typical mix, then. A heavy right foot also played into that result, so expect a better return after a regular run.

For reference, the GLB35’s 60L fuel tank can be filled up with 98RON petrol at minimum.

Here’s the tricky bit. The X3 xDrive30e has an official combined fuel consumption of just 3.2L/100km, but this will depend heavily on how you drive it.

You see, the BMW hybrid system is very keen to drive under electric power alone, even in the so-called ‘hybrid’ driving mode. This will mean you will extinguish the battery’s 41km driving range (or 35km according to our test vehicle on a full charge) quite quickly, whether you like it or not.

Plus, the charging capability is a bit slow. At 3.7kW, the PHEV X3 charges its 12kWh battery up in 2.6 hours on a faster public outlet or garage wall box, or around five hours on a wall socket.

To put it in perspective, the Lexus NX 450h+ showed me nearly double the amount of electric driving range on a single charge (65km as-tested) and was capable of charging up at a rate of 7.2kW, meaning a two hour flat charge for twice the range on a public outlet.

The summary boils down to: If you charge up at home, this won’t be as much of a problem, if you need to rely on public charging, it could make a difference to the PHEV you pick.

You can prolong the life of the battery using the ‘battery level’ mode which lets you set a target for battery life and have the car switch to primarily combustion at that point.

This can come in handy if you have a lot of open-road driving, and want to conserve the battery for driving around town where it is most efficient.

On my week with the car I saw an impressive consumption figure of 2.2L/100km according to the trip computer, under the official number, while my energy consumption came in at 20.7kWh/100km against a claim of 16.4kWh/100km. I did make sure to charge the car up at every opportunity, however.

Like all BMWs the X3 xDrive30e requires mid-shelf 95RON unleaded fuel, and has a 50L fuel tank despite the addition of its high-voltage battery.

Don’t let the GLB35’s family friendliness fool you, this is an SUV that can get up and go.

The engine’s extra power and torque over the GLB250 are immediately felt behind the wheel, with the GLB35 accelerating with the vigour of an all-wheel-drive hot hatch, which makes sense given their similar claims.

And if you have one of the sportier drive modes engaged, the booming noise generated is also special – even if a lot of it is of the artificial variety, pumped into the cabin to make occupants feel like things are getting serious.

What is genuine, though, is the well-rounded transmission, which is characteristically quick with its upshifts. At the same time, it’s also relatively smooth, even at low speed, which has proven to be a challenge for dual-clutch units over time, but not here.

To earn the AMG badge, the GLB35 goes even further with other mechanical upgrades, including sports tunes for the suspension and steering.

Specifically, the GLB35’s independent suspension set-up not only consists of MacPherson-strut front and trailing-link rear axles with adaptive dampers, but also introduces new steering knuckles, transverse control arms on the front axle, and a stiffened subframe.

The resulting ride is actually quite good. Yes, the extra firmness over the GLB250 is noticeable – particularly in the sportier drive modes that stiffen the adaptive dampers all the way – but it’s by no means a deal-breaker.

That said, it’s worth noting our test vehicle was fitted with the optional 21-inch alloy wheels ($1990), so the GLB35’s like to ride even better on its standard package.

This is remarkable considering the handling improvements made, with the GLB35 managing body roll and pitch better than the GLB250 when pushing hard into and around corners, coming out of which grip is plentiful thanks to the all-wheel-drive system.

Thankfully, the standard-fit high-performance braking package consisting of 350mm front and 330mm rear discs with four- and one-piston callipers respectively helped it wash speed away with ease when attacking the twisty stuff with intent, even with 1857kg (kerb) to deal with.

Also on hand is electric power steering, which is speed-sensitive and has a variable ratio in the GLB35. Basically, it’s quicker when you want it to be, remaining on the lighter side in hand until you engage one of the sportier drive modes and weight is increased markedly.

One of the things I came to love most about this version of the X3 is how seamless the hybrid system is, and how unusually quiet and comfortable this car proved to be.

Sure, it’s a luxury mid-size SUV, but I came away particularly impressed with how the adaptive suspension tune pairs so nicely with the electrified acceleration to make for a sleek driving experience.

Despite its dimensions, the xDrive30e feels light and springy over bumps, filtering out the worst of the road while keeping a good level of control at the wheels.

The stock steering tune in the car’s standard ‘hybrid’ driving mode is nice and light, too, making this mid-sizer feel smaller than it really is to pilot, and you don’t feel the extra weight of the battery pack at all.

The combustion engine is so quiet it is at times difficult to tell when it enters the mix, aside from the fuel consumption meter on the dash suddenly coming to life.

It too is a smooth unit, providing partially electrically-assisted acceleration in most modes which makes it hard to tell when the transmission changes cogs. It’s as though you get the best of both worlds this way.

The car is a bit too keen to rely on its electric driving, and, as mentioned earlier, this will mean it drains its battery relatively quickly unless you take extreme measures like the battery saver mode.

The result is a car which is far better suited to shorter city-based journeys than long tours through the country. At least the turbocharged engine and BMW driving dynamics are left intact should your battery run dry.

The regen braking is mild (able to recoup a max of 20kW at any given moment), although the indicators on the dash are neat for letting you know the limit of your electric acceleration and how far you’ve travelled without using the combustion engine.

On my week with the car I managed over half the distance with the engine completely off. Think of the fuel savings.

Elsewhere the X3 offers great visibility thanks to a boxy shape with big windows, and solid electric acceleration, with decent handling, too. I’d say it feels sportier than the Lexus NX or Merc GLC equivalents, with the ride a bit more forgiving than that of the Volvo XC60 Recharge.

As an EV then the xDrive30e is notably limited, but as an SUV which threads the needle of being both engaging and comfortable, it’s possibly the best of the current premium mid-size SUV PHEV pack.

The X3 range has a healthy list of standard active safety equipment, with items like freeway-speed auto emergency braking, rear auto emergency braking, lane departure warning with lane keep assist, blind-spot monitoring with rear cross-traffic alert and adaptive cruise control.

It also has a speed limit assist function and a rather cool parking suite which gives you a 3D surround picture of the car capable of adjusting to particular angles when objects get close.

The X3 has the standard array of dual front, dual side, and dual head curtain airbags, as well as seatbelt pre-tensioners. There are dual ISOFIX points on the outboard rear seats, or three top-tether mounts across the rear row.

The base X3 offerings have a maximum five-star ANCAP safety rating to the 2017 standard, although this plug-in hybrid variant was not available at the time.

As with all Mercedes-AMG models, the GLB35 comes with a five-year/unlimited-kilometre warranty, which currently sets the standard for the premium market. It also comes with five years of roadside assistance.

The GLB35’s service intervals are long, at every 12 months or 25,000km (whichever comes first). Better yet, it’s available with a three-year/75,000km capped-price servicing plan, but it costs $2750, with the third visit alone incurring a $1300 charge.

BMW languishes with just three-years of warranty coverage. The brand along with its Mini subsidiary has become a notable laggard in the space now, its last remaining Audi rival has moved on to match the five-year and unlimited kilometre promise of its VW parent.

Servicing on BMW models is ‘condition dependent’ meaning the car’s computer will keep track of when servicing needs to happen based on how the car is driven and other factors.

A five-year ‘basic’ service pack is available inside the first 12 months of purchase and covers visits inside this period or 80,000km whichever occurs first. It costs $2010, or $402 a year.