Mercedes-Benz Glb250 vs Audi RS4

What's the difference?

Well, Mercedes-Benz has done it again, finding (or creating, depending on your position) a niche and filling it. But unlike some others that preceded it, this example is a good one.

Despite its safety and handling shortcomings, the GLB 250 looks the part, is undeniably practical and serves up surprising performance, which means it's a winner in our books.

What a way to send off this generation of Audi RS4 and RS5. The extra focus courtesy of those trick coil overs and drama from the exhaust plus the sharper gear changes deliver the best Audi has done with these RS products. 

There are some compromises, with the suspension favouring outright control over low-speed comfort. It’s also true that the current BMW’s M3 and M4 are more impressive, but when the products are nearly seven years fresher than Audi’s, what do you expect? 

Plus, those looking for a more restrained and polite fast executive sedan (or wagon) will gel with the Audi’s sophistication. There aren’t many of these Competition Plus RS4 and RS5s coming to Australia and they are impressive visually and from behind the wheel. It’s a fitting way to send off the current generations.

Note: CarsGuide attended this event as a guest of the manufacturer, with accommodation and meals provided.

These days, so many SUVs try to toe the coupe line by incorporating a sloped-back roofline –and yes, the same is predominantly true of those that call themselves traditional wagons.

That said, prepare yourself for a bit of a throwback, because the GLB 250 is about as faithful to the classic two-box design as it gets in 2020, which we absolutely love.

Up front, it's undoubtedly a Mercedes-Benz SUV, albeit with a much squarer appearance. Simply put, the GLB 250 looks butch.

We particularly love its simple LED headlights, classic grille and strong bumper, which make it look smart but capable.

Around the side, the GLB 250 is a typical small SUV with black plastic cladding covering its wheelarch extensions and connecting skirts.

The otherwise plain design is spiced up by a sporty set of alloy wheels (our test vehicle was fitted with 18-inch items with 235/55 runflat tyres) and an unusual kink in the glasshouse, around the C-pillar.

The GLB 250 is at its best at the rear, where it exudes presence, with the tough look punctuated by the droopy LED tail-lights and a prominent bumper, which houses a diffuser element flanked by dual exhaust tailpipes.

Inside, the GLB 250 quickly reveals itself to be a technological tour de force. And yes, if its cabin looks familiar, it's because its mechanical relatives (A-Class, B-Class, CLA and GLA) more or less have the same cockpit.

As expected, a pair of 10.25-inch high-resolution displays sit side by side proudly atop the dashboard, with one the central touchscreen and the other the digital instrument cluster.

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

The GLB 250 is properly premium where it counts. Sure, trainspotters will notice the black 'Artico leather' upholstery covering the steering wheel, seats, armrests and door shoulders is of the artificial variety, but it's inoffensive, unlike in some of its SUV siblings.

Soft-touch materials are used for the upper dashboard, leaving hard plastics for the lower sections, which is exactly what you'd hope for at this price.

While a black headliner lends itself to a dark cabin, brighter highlights come by way of the metallic trim used throughout, notably on the steering wheel, dashboard, doors and centre console. And let's not forget the sensational ambient lighting. It's very, very cool.

And mercifully, gloss-black accents are limited to the surrounds of the steering wheel, turbine-style front air vents, dual-zone climate controls and centre console. The less scratches and fingerprints the better, we say.

The RS4 Avant’s 'Progressive Red' metallic helps the black milled 20-inch alloy wheels pop. Its stance is hugely purposeful with wheels tucked right up in the blistered arches courtesy of the lowered ride height — it's how the Avant would have looked in a design sketch.

The visual bulk of the long-roofed RS4 gives it the sort of proportions motoring journalists love to wax lyrical about, even if plenty of buyers still prefer coupes or lifted SUVs. 

The RS5's more flowing, elegant lines match well with the Navarra Blue paint work, silver-accented wheels and conventional leather-appointed seats within. 

Both cars have effectively identical front cabins reflecting Audi’s classy and sleek design language. The integration of technology is pretty good and the RS4’s additional red styling pack really makes it feel sporty within.

Measuring 4638mm long (with a 2829mm wheelbase), 1834mm wide and 1659mm tall, the GLB250 is closer in size to the GLC than the GLA, making it a small SUV on paper only. And that only means good things when it comes to practicality.

For example, cargo capacity with the 50/50 split-fold third row stowed is strong, at 565L, but it can be increased to a massive 1780L with the 40/20/40 split-fold middle bench also out of action. If six or seven seats are in use, though, there's limited space to play with.

That said, the boot is still very well thought out, as evidenced by its massive aperture, lack of a load lip, and flat floor, which make loading bulkier items a lot easier. And yes, its load cover can actually be stored underfloor when not in use!

There are also four tie-down points, two bag hooks, a side storage net and a 12V power outlet to make things that little bit easier, while the rear seats can be operated from behind.

Speaking of which, let's cut straight to the point: Mercedes-Benz claims the third row can accommodate occupants that are up to 168cm tall thanks to the middle bench's ability to slide fore and aft by up to 140mm.

Therefore, my 184cm (6.0ft) frame is a little too tall, but I was still able to sit in the back, albeit not in complete comfort, with about a centimetre of legroom and negligible headroom and toe-room on offer.

The biggest challenge for any occupant is getting in and out in the first place, as the middle bench doesn't tumble forward for easy access. Needless to say, you're not going to look graceful here. Children can learn to deal with it, but adults won't be excited by the prospect.

So, the middle bench is where it's at, even when slid all the way forward. Behind my driving position, it provides about a centimetre of legroom, but this can be increased to a generous 8.0cm by sliding it all the way back.

Either way, plenty of toe-room is available alongside more than an 2.0cm of headroom – and that's with a dual-pane panoramic sunroof fitted.

The second row can accommodate three adults at a pinch, partly thanks to the short transmission tunnel that ensure there's just enough space for three pairs of fully grown feet across the two footwells. Children will be fine.

While we're on the topic, four ISOFIX and five top-tether anchorage points are on hand for fitting up to four child seats across the second and third rows, making the GLB250 a genuine option for families.

In-cabin storage options are numerous, with the central storage bin on the larger side despite housing a pair of USB-C ports, and the glove box is also pretty handy, even if it does have an odd shape. There's also a sunglasses holder in front of the rearview mirror.

The centre console's cubby doesn't lend itself to storage, though, as it's more or less taken up by two cupholders, another USB-C port and a wireless smartphone charger.

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

Second-row occupants are further treated to a fold-down armrest with another pair of cupholders, although they're of the retractable (flimsy) variety.

These passengers also have access to two USB-C ports, which fold out below a small cubby and a pair of air vents, which are located at the rear of the front centre console. There are also storage nets on the front seat backrests.

And don't make the mistake of thinking the third row misses out on the action, as two cupholders (one regular, the other small) divide the seats, which have their own USB-C ports and device straps to the sides.

The RS4's cabin is excellent, with a good mix of physical buttons and responsive touchscreens for control. There’s enough storage space for this kind of vehicle, with good door bins and well-sized cupholders in the centre as well as USB-C and -A charge points. 

Audi’s multimedia system is friendly though the large touch targets and dark background aren’t as crisp as those fitted to the latest rivals. The screen isn't as big, either, measuring 10.1 inches for the multimedia item. The RS4 supports wireless Apple CarPlay and Android Auto.

That said, Audi’s 12.3-inch digital driver’s display with bright and poppy mapping software and generous customisation remains right at the head of the pack. 

There is a panel of switches below the touchscreen for climate control, physical selection of the five-or-so drive modes and a collection of helpful buttons on the perfectly-shaped and sized leather-appointed steering wheel.

It lacks F1 or DTM wow-factor compared to the C63 and M3 with their easy-access driver mode buttons and toggles on the steering wheel but the RS4's restrained looks will resonate with those that prefer a bit more elegance inside. 

Neither the RS4 nor RS5's back seats are designed for those over about 175cm. The RS4’s roof is a little higher so it is good enough for most adults but the RS5’s sloping profile compromises things. It has two individual buckets compared to the RS4’s three-wide bench. 

Rear seat passengers get air vents, an individual climate zone, bottle holders in the doors, USB charge points and ISOFIX attachments for the outboard seats, with matching top tethers in the seat backs.

The Audi RS4’s boot is a generous 505L with under floor storage and a netted area on the driver’s side. Folding the 40/20/40 split-fold bench increases space to 1495L. That said, the RS5’s 465L is still very good, though it is not quite as practical in the real world. 

Being fitted with roof rails makes for sleek integration of roof racks for the RS4 to slip roof pods, bike racks or whatever else you might choose to take on a trip away.

You'd expect the RS5 to be more popular given how uncool wagons are these days but Audi's whole thing is wagons — or Avants, for the initiated — so it makes sense that the RS4 Avant outsells the RS5 Sportback about two-to-one.

For the RS4 Avant’s basic asking price of $165,015, before on-road costs, you get luxury features such as LED headlights, an RS design package, Nappa leather upholstery, power-adjust seats, a Bang & Olufsen 19-speaker sound system and metallic paint on top of the significant changes to the RS4’s chassis and zingy 331kW V6. 

The RS5 is a little dearer, reflecting the addition of Matrix LED headlights that aren’t available on the wagon.

But we have the 'Competition Plus Pack', which is a $13,990 indulgence that swaps adaptive dampers for Audi’s 'RS Sport Suspension' coil over package with manual rebound and compression adjustment and height adjustment.

The cars sit 10mm lower than a normal RS4 but you can go to a dealer to move the ride height up or down from there. 

That’s not it, though. You also get a louder exhaust system with matte black pipes, fixed-ratio steering system, a retuned eight-speed automatic with more aggressive shifts, different rear differential programming, black exterior badging, 2.0kg lighter 20-inch Audi Sport wheels (in silver or black), special LED entrance lights and your speed limiter raised to 290km/h.

The 'Navarra Blue' RS5 pictured is a ‘basic’ Competition Plus. You can go further, as done with the RS4 Avant with its manual-adjust bucket seats ($1300), 'Interior Design Pack' in red ($3400), matte carbon exterior pack ($6300) and carbon trim, bringing its total cost to $191,405, before on-road costs. 

That makes the RS4 and RS5 the most affordable in their competitor set, below a BMW M3 Competition xDrive Touring ($183,500) and Mercedes-AMG C63 S E Performance hybrid, which is $187,900, before on-road costs.

The GLB 250 is motivated by a peppy 2.0-litre turbo-petrol four-cylinder engine that produces 165kW of power from 5500-6100rpm and 350Nm of torque from 1800-4000rpm.

This unit is mated to an eight-speed dual-clutch automatic transmission that's solid on debut, while Mercedes-Benz's 4Matic all-wheel-drive system is also in tow.

Thanks to this combination, the GLB250 can sprint from a standstill to 100km/h in a brisk 6.9 seconds while on the way to its top speed of 236km/h. It also enables a maximum braked towing capacity of 2000kg.

Audi’s 2.9-litre twin-turbo petrol V6 has seen plenty of use across performance products from Audi and Porsche, including the Macan S and Audi S6. 

In the RS4 and RS5 Competition Plus, it develops the same 331kW (at 5700-6700rpm) and 600Nm (at 1900-5000rpm) as the regular car. This makes it an extremely flexible engine that delivers predictable punch anywhere in the power band.

That said, it lacks the explosive character of BMW’s twin-turbo inline six — the figures are only 15kW and 50Nm higher on paper yet the M3’s response is that much more ferocious. 

Audi’s RS division has tried to capture a bit more emotion, retuning the eight-speed torque converter automatic transmission for crisper shifts. This also benefits the RS4’s 0-100km/h sprint time, which falls two tenths to 3.9 seconds in Competition Plus guise. 

The V6 breathes a little easier, too, with a different exhaust. Audi says the extra sound is down to 8.0kg less sound deadening in the car.

There’s more resonance at idle that does feel tiring sitting in traffic idling but the trade-off is a brawny mid-range baritone that develops into a shrill bark approaching the redline.

The GLB250's fuel consumption on the combined-cycle test (ADR 81/02) is 7.7 litres per 100 kilometres, while its carbon dioxide emissions are 173 grams per kilometre. Both claims are pretty solid.

In our real-world testing, though, we averaged 8.9L/100km over 180km of driving skewed towards country roads over highways. As such, it's a strong result, especially when you consider my lead foot.

For reference, the GLB 250's 60L fuel tank takes 95RON petrol at minimum.

The Audi RS4 wagon is rated to use 9.5L/100km in ADR combined cycle (urban/extra-urban) consumption testing while the slipperier RS5 returns 9.4L/100km in the same test. 

We weren’t able to run accurate or particularly relevant fuel figures on the event but the trip computers showed around 12L/100km in both RS4 and RS5. 

While these numbers are high compared to your average passenger car, the Audi is more efficient than BMW's rivals, and gets remarkably close to the hybrid C63 in the real world.

The fuel tank is quite small for this kind of vehicle at 58 litres. That limits the RS4’s theoretical driving range to 611km. 

Unsurprisingly, the Audi RS4 and RS5 require 98 RON premium unleaded petrol. 

Families are sure to be pleased by the way the GLB 250 drives, because it can be summed up in one word - comfortable.

A lot of the credit has to go to the GLB 250's independent suspension set-up, which consists of MacPherson-strut front and trailing-link rear axles with adaptive dampers.

The ride is sensational, with the GLB just wafting along on the highway. Take it onto a coarse-chip road and this quality does suffer, but not much. That said, road noise does become more of a factor on lower-quality tarmac.

It's worth reiterating that our test vehicle was fitted with 18-inch alloy wheels, which are an inch smaller than the GLB 250's standard set that come with lower-profile tyres (235/50), so the chances are our glowing review doesn't apply across the board.

There were also some noticeable underbody creaks when navigating speed bumps and the like, but hopefully they're just specific to our test vehicle.

What will be more consistent, though, is the wind noise generated by the side mirrors at highway speeds. It penetrates the cabin and disturbs its serenity more than any underbody creak ever could, so turn up the sound system.

Handling-wise, the GLB 250 performs just as well as any other non-performance SUV with seven seats and a high centre of gravity, with body roll prominent when cornering with intent.

Put the aforementioned adaptive dampers into their sportiest setting and body control improves somewhat, but you'll still be conscious of the GLB 250's 1721kg kerb weight.

Either way, grip is quite good due to the all-wheel drive system, which works hard to keep things on track. Its front bias is apparent, though, with the GLB 250 running wide of its line at times.

While it's not the sharpest handler, the GLB 250 is far from awful, partly thanks to the electric power steering's variable ratio set-up.

This system goes from lock-to-lock with ease at low speed, making parking manoeuvres much easier to perform, while it's far more stable at high speed.

However, it's not the first word in feel despite being well-weighted… until you make the mistake of engaging the GLB 250's Sport drive mode, which adds too much artificial weight.

Speaking of sporty, the GLB 250 is surprisingly fun in a straight line thanks to its strong engine and transmission combination.

I particularly enjoyed the 2.0-litre turbo-petrol four-cylinder engine's mid-range, headlined by a useful 350Nm of max torque from 1800-4000rpm.

Once it comes and goes, though, it's a 'long' wait until 165kW of peak power kicks in from 5500-6100rpm, so best to up-shift early.

Doing so is very easy due to the new eight-speed dual-clutch automatic transmission, which serves up gear changes that are only smooth, but quick.

Engage Sport drive mode and the engine and transmission become that little bit sharper, with the former's throttle response improved, while the latter adopts more aggressive shift patterns.

That said, it's best to resist that temptation, as the GLB 250 is at its best when driven calmly, while it exudes family-friendly comfort.

The time allocated to driving the RS4 Avant Competition Plus was fairly limited and we were sadly unable to sample how the highly adjustable coil over suspension performed where it makes most sense — on the racetrack. 

Still, winding country roads between Sydney and the Southern Highlands served up some challenges, demonstrating how the Competition Plus pack changes the character of the RS4 and RS5. 

The only real negative is comfort, specifically over those horrible plastic speed bumps that litter shopping centre car parks. With adaptive dampers, carmakers can set programs for these kinds of obstacles to soften and stiffen the clever shocks at just the right time. Not so the Competition Plus pack cars, which ride these bumps harshly.

That about does it, though, and everything thing else is a net benefit. The steering system addresses some criticism of the earlier RS4s. Further than a retune, the Competition Plus gets a new rack, that is non-progressive with a fixed ratio of 15:1 (instead of 13.3:1) and 2.4 turns lock-to-lock. The reactions to each input feel a hint more faithful. 

When above 40km/h the coil overs come into their own. Even though the RS4 rides firmly it doesn’t constantly jiggle over small bumps. Over sharp-edged hits, the suspension rounds the hits off so, while you feel them, there’s a sense of control and sophistication. 

Having speed limits to contend with means it is essentially impossible to find the limits of grip of the 275/30R20 Continental SportContact 6 tyres on the road and there isn’t much body roll, either.

The RS4 is still rewarding, though, getting up on its toes just enough through a series of bends to feel engaging. It gives an impression of being quite light and at 1820kg it is now considered featherweight next to rivals.

The RS4's Quattro all-wheel drive system favours the rear wheels when driving normally (60 per cent rear) and can send up to 85 per cent of the drive to the back axle. 

The tweaked electronically-controlled rear limited-slip differential amplifies the throttle steer-ability of the RS4, giving you the confidence to squeeze the gas on exit. 

It helps that the Competition Plus bucket seats are a little thinner and set closer to the floor giving you more feedback. This is the key differentiator between the RS4 and RS5 we drove — the buckets make the car feel alive. 

Strong brakes are made up of 375mm front rotors clamped by six-piston calipers. Optional carbon ceramic brakes with larger 400mm front rotors help save 6.5kg and, if you plan to use the RS4 on track, are a smart buy along with a set of Pirelli P Zero Corsa semi slick tyres ($850). 

Really, though, neither the RS4 nor RS5 are the perfect car for the track. They are plenty capable and fast on the road with just enough fun, reward and character thrown in to keep you coming back for more.

The Audi A4 range was rated a maximum five stars in ANCAP safety testing in 2021, with the rating now considered expired. The stamp also only applied to four-cylinder models — so not the RS4 we drove. 

It has lots of safety equipment, including eight airbags (dual frontal, side chest, front and rear side head curtains), autonomous emergency braking (AEB) functional up to 250km/h with pedestrian detection, front and rear cross-traffic alert, lane-keep assist, blind-spot monitoring, safe exist warning and tyre pressure monitoring.

Adaptive cruise control with lane-trace assist makes it an easy car to use on the motorway. The systems are well integrated and easy to switch on and off as you like. 

As with all Mercedes-Benz models, the GLB 250 comes with a five-year/unlimited-kilometre warranty, which is the gold standard for the premium market. It also comes with five years of roadside assistance.

The GLB 250's service intervals are every 12 months or 25,000km, whichever comes first. It is available with a three-year capped-price servicing plan for $2650, but its pricing can be reduced by $500 if paid upfront alongside the vehicle.

Audi covers the RS4 and RS5 with a five-year/unlimited kilometre warranty which is now the expected norm across the premium part of the market. 

A five-year service plan can be pre-purchased, costing $3630 for both models with maintenance due annually or every 15,000km. 

After the five-year warranty period, owners can choose to extend the service packaging and warranty for two extra years at a cost of $4260. This can be done twice, extending the warranty up to nine years.