Mercedes-Benz GLS-Class vs Land Rover Discovery

What's the difference?

The GLS63 is an intimidating beast from afar, but it rewards its occupants in almost every way. Yep, there really isn’t a box it doesn’t tick without serious compromise, such is its breadth of capability.

If there was ever a Swiss Army Knife of cars, the GLS63 is definitely a contender for the title, one that makes it very hard to wipe the smile off your face. Just make sure you can fit it in your garage first…

The Land Rover Discovery D300 S is a great family-friendly 4WD wagon.

It’s quiet, refined, and supremely well appointed; it’s also very nice to drive on-road and it’s a lot of fun – and very capable – off-road. 

It’s packed full of driver-assist tech and its Pivi Pro system is a real treat to use once you’ve mastered the art, which doesn’t take long.

But you could say all of those same things about the new Defender. 

So, is the Discovery still relevant? I reckon it is … at least for the time being.

If the GLS63 was a Marvel superhero, it would undoubtedly be the Hulk. Simply put, it has road presence like few others. In fact, it’s frankly menacing.

Of course, the GLS is already pretty intimidating due to its sheer size and blocky design, but the GLS63’s full-fat AMG treatment takes it to another level.

Naturally, the GLS63 gets an aggressive body kit, with its purposeful bumpers, side skirts and rear spoiler serving as instant reminders of what you’re dealing with, but it’s AMG’s signature Panamericana grille insert that really hammers home the point.

Around the side, the GLS63’s 22-inch alloy wheels with staggered tyres (front: 275/50, rear: 315/45) make their presence known, positioned below the wheelarch extensions.

That said, some fun’s also had at the rear end, where the GLS63’s diffuser element integrates the foreboding sports exhaust system with quad tailpipes very neatly.

The focused Multibeam LED headlights also look the part, while the opposing LED tail-lights tie everything together outside quite nicely.

Inside, the GLS63 stands out from the GLS crowd with its sports steering wheel with Dinamica microfibre accents, and multi-contour front seats, which are covered in Nappa leather alongside the armrests, dashboard and door shoulders and inserts.

Of note, the doors bins are unfortunately of the hard plastic variety, which is very disappointing in a vehicle that costs this much. You would expect that cow hide would also been applied to them, but alas it isn’t.

The GLS63’s black headliner serves as an obligatory reminder of its sporting intent, and while it makes for a dark cabin, metallic accents are prominent throughout, while the optional trim (our test vehicle had carbon-fibre) mixes things up, alongside the ambient lighting.

And let’s not forget the GLS63 is still loaded with plenty of cutting-edge technology, including a pair of 12.3-inch displays, with one the central touchscreen and the other the digital instrument cluster.

Both are powered by Mercedes’ class-leading MBUX multimedia system and feature Apple CarPlay and Android Auto support. This set-up arguably remains the best there is today thanks to its speed and breadth of functionality and input methods.

As always, I’ll avoid waxing lyrical about the styling of a vehicle – suffice to say, it looks good.

In terms of dimensions, this Discovery is 4956mm long (with a 2923mm wheelbase), 2220mm wide and 1888mm high.

It has a listed kerb weight of 2437kg.

Measuring 5243mm, 2030mm wide and 1782mm tall with a 3135mm wheelbase, the GLS63 is an upper-large SUV in every sense of the term, which means it’s also very practical.

For example, cargo capacity below the load cover is decent, at 355L, but stow the 50/50 power-split-folding third row via the boot and it’s very good, at 890L, or drop the 40/20/40 power-split-folding middle bench, too, and it becomes a cavernous 2400L.

Better yet, the boot’s aperture is almost square, and its floor’s flat, while there’s no load lip to contend with, making loading bulkier items even easier. Up to four tie-down points are also on hand (depending on seating configuration) to secure loose cargo.

Under the false floor is the space-saver spare, which is to be expected, but what isn’t expected necessarily is the fact there’s also enough room there for the cargo cover when it’s not in use, which would be the case if six or more passengers are regularly onboard.

Moving into the power-sliding second row, the GLS63’s practicality is once again brought to the fore, with up to six-plus inches of legroom available behind my 184cm driving position.

There’s also two inches of headroom with the panoramic sunroof in situ, not to mention just enough toe-room. The GLS63’s small transmission tunnel and sheer width also mean three adults can be seated on the middle bench with few complaints.

Amenities-wise, the second row has map pockets on the front-seat backrest and a small fold-down cubby below the rear climate controls, with it containing two slots for smartphones and a pair of strategically placed USB-C ports.

The rear door bins can take one large bottle each, while a fold-down central armrest is also on hand, featuring a shallow tray and retractable (and flimsy) cupholders.

Alternatively, the $2800 Rear Seat Comfort Package fitted to our test vehicle subs in a tablet that can control the multimedia system, a wireless smartphone charger and a small cubby into the former, as well as a heated/cooled cupholder atop the rear of the centre console.

In the third row, it’s not quite as roomy if you’re an adult. With the middle bench in its most accommodating position, my knees still brush up against its backrest, which is to be expected given it’s primarily designed for children. I also have an inch of headroom there.

Nonetheless, getting in and out of the third row is relatively easy as the power-operated middle bench tumbles forward and provides just enough space to make entry and exit somewhat graceful.

When seated, rear occupants are treated to two USB-C ports and one small cupholder each, so they’re arguably taken better care of than those in the middle.

Child seats are well and truly accommodated, with four ISOFIX and five top-tether anchorage points fitted across the second and third rows, although the latter will inevitably prove to be a much tighter fit.

The driver and front passenger are still taken care of, with a front cubby taken up by two heated/cooled cupholders, a wireless smartphone charger, two USB-C ports and a 12V power outlet, while their door bins take one large and one small bottle each.

In-cabin storage options include the large central storage bin, which hides another USB-C port, while the glovebox is on the smaller side, with about a third of it taken up by the fragrance, which is pumped into the cabin to ensure the interior always smells its best.

The interior has a real premium feel about it, but it still serves as a very practical space.

In terms of cargo space, there is 2391 litres with the second and third row stowed away; 1137 litres with the third row stowed away; and 258 litres with all rows in use.

The third-row seats can be either manually folded down into the floor to use that area as cargo space, or lifted up into a seating position.

There is a load-space cover, light, luggage tie-downs, bag hook and 12v in the rear, and two USB charging sockets for the third-row passengers.

The second row is a 60:40 electric-folding set-up with manual slide and powered recline, centre headrest and armrest, as well as map pockets, and door-moulded recesses. Second-row passengers get two USB C and one USB A charging points, air vents, air-con controls and more.

The front seats are 14-way electrically-adjustable with captain’s armrest, grained leather seat facings with Ebony interior; the Pivi Pro 11.4-inch touchscreen with digital radio, Apple CarPlay and Android Auto; as well as one USB A and three USB C points.

The Discovery has a fixed front and rear panoramic roof.

For reference, this Discovery D300 S has a price-tag of $101,875* (plus on road costs).

As standard, the seven-seat Discovery’s list of features is considerable, as it should be at this price-point, and includes a 11.4-inch Pivi Pro multi-media touchscreen (like an all-in-one vehicle operating system, but more about it later), Apple CarPlay and Android Auto, fixed sunroofs, 3D Surround Camera, height-adjustable air suspension, 20-inch five-split-spoke, gloss silver wheels, and a whole lot of driver-assist tech.

There are also plenty of optional features available, which obviously push the price up the more you add to your Disco.

Our test vehicle was equipped with a stack of those extras and, because of that, its price-tag was $110,910* (plus on-road costs). (Prices correct at time of writing.)

Optional features on our test vehicle include Advanced Off-Road Capability Pack ($3970, twin-speed transfer box (high/low range), All Terrain Progress Control, Terrain Response 2, Configurable Terrain Response; Active Rear Locking Differential $1110; Tow hitch receiver $1000; Leisure Activity Key $960; Black Roof Rails $940; Privacy glass $920; Premium carpet mats $640; and wireless device charging $455.

By the way, the Discovery is available in a variety of colours including Fuji White, which is on our test vehicle, as well as versions of black, blue, grey and silver.

The GLS63 is powered by a familiar 4.0-litre twin-turbo V8 petrol engine, with its version producing a thumping 450kW of power at 5750rpm and 850Nm of torque from 2250-5000rpm.

This unit is mated to a nine-speed torque-converter automatic transmission and AMG’s fully variable 4Matic+ all-wheel-drive system with torque vectoring and a rear limited-slip differential.

This set-up also features Mercedes’ EQ Boost 48V mild-hybrid system, which actually gives a 16kW/250Nm electric boost in short bursts, such as when accelerating off the line.

Speaking of which, the GLS63 sprints from a standstill to 100km/h in just 4.2 seconds, while its top speed is electronically limited to 250km/h.
 

The Discovery has a 3.0-litre inline six-cylinder twin-turbo-diesel engine – producing 220kW at 4000rpm and a whopping 650Nm at 1500-2500rpm – working with a mild hybrid system. 

Those impressive power and torque figures don’t tell the whole story of just how well the Disco’s engine is able to punch this big unit along the road at a comfortable clip and – bonus – its chunk of torque, useable across a decent rev range, comes in very handy when off-roading.

It has an eight-speed automatic transmission and an all-wheel drive system.

The GLS63’s fuel consumption on the combined-cycle test (ADR 81/02) is 13.0L per 100km, while its carbon dioxide emissions are 296 grams per km. All things considered, both claims are unsurprisingly high.

In our real-world testing, we averaged a fearsome 18.5L/100km over 65km of driving, split between highways and country roads, so not your usual mix. A very heavy right foot definitely influenced that result, but don’t expect to do too much better in a normal run.

For reference, the GLS63’s 90L fuel tank can be filled up with 98RON petrol at a minimum.

Fuel consumption is listed as 7.5L/100km on a combined cycle. 

Fuel consumption on this test was 9.8L/100km. That’s sound considering I did a lot of high- and low-range 4WDing on this test and the Disco is quite a hefty unit.

The Land Rover Discovery D300 S has an 89-litre fuel tank, so, going by those fuel-consumption figures, I’d expect an effective touring range of about 860km, but remember that figure includes a built-in 50km safe-distance buffer. 

Frankly, the GLS63 has absolutely no right being as capable as it is. It’s a really big bus that’s legitimately convinced it’s a sports car half its size.

Being a GLS variant, the GLS63 has independent suspension consisting of four-link front and multi-link rear axles with air springs and adaptive dampers, but its party trick is the addition of active anti-roll bars.

In what feels like magic, the GLS63 is simply not intimidated by corners, despite having massive dimensions and a considerable 2555kg (kerb weight) to deal with.

The active anti-roll bars make the GLS63 so much easier to drive fast through the twisty stuff, almost eliminating body roll, taking one key variable out of the equation for the driver. Active engine mounts are also fitted, helping to settle things even further.

The electric power steering on hand is also good. It is speed-sensitive and has a variable ratio, which basically makes the set-up more direct when it needs to be. It’s typically light in hand, too, until one of the sportier drive modes is engaged and extra heft is added.

So, handling is scarcely believable, which means the ride must be compromised, right? Yes and no. With the adaptive dampers in their softest setting, the GLS63 is very compliant. In fact, we’d say it feels luxurious when compared to other high-performance SUVs.

That said, our test vehicle was fitted with the optional 23-inch alloy wheels ($3900), which look the part but expose sharp edges and other road imperfections, not to mention generate noise easily heard inside. Naturally, feedback is exacerbated in the sportier drive modes.

Anyway, there’s more performance, and the GLS63 has the rest in spades. Its engine is a powerhouse in every sense of the word. It’s so powerful, in fact, that it hilariously hunkers down off the line or when suddenly accelerating at low speed.

Thanks to the mild-hybrid system, wads of torque is available from the get-go, making for a highly responsive driving experience, even in those rare moments when the engine isn’t on song.

While not as characterful as some of the other members in the 63 series, the GLS63 still makes some thoroughly entertaining noises, with its sports exhaust system popping like mad while on the overrun.

All of this ability is very well and good, but you need to be able to pull up quickly, and the high-performance braking package (400mm front and 370mm rear discs with six-piston fixed callipers and single-pot floating stoppers respectively) mercifully does exactly that.

The Discovery is very impressive on-road. No surprise really as it has always had a reputation as a comfortable on-road cruiser – and it's lost nothing in this latest iteration. 

It is a smooth driving experience: quiet, refined and you suffer little to no noise from outside intruding into the cabin. 

The seats are very comfortable and supportive, and that makes it perfect for long-distance trips. 

The straight-six engine and eight speed auto are a nice combination, quietly effective, and well-managed. 

Acceleration is good with sharp throttle response, so you can crack on the pace when you need to, say, for instance, from a standing start or when you need to overtake a vehicle. 

In terms of overall driving experience, there’s nothing too outrageously exciting or dynamic on offer here, because this is a large SUV, but it’s always comfortable and it’s lively enough if you want to give it the boot. There are paddle shifters if you want to get fancy with your up- and down-shifting.

It’s not all good news: visibility from the driver’s seat is a bit pinched out the rear of the Discovery (due to its styling); there is pronounced body-roll through corners; the brakes are quite spongy, with a real delayed-action feel about them; ride is a tad harsh because you are rolling along on 20-inch tyres and rims, which is something I’m not so used to; and, the steering column is manually adjustable only, which I reckon is a bit slack for such a pricey vehicle.

The Land Rover Discovery D300 S has the maximum five-star ANCAP safety rating, based on 2017 testing. 

As standard, its suite of driver-assist tech includes AEB, adaptive cruise control, blind-spot assist, lane-keep assist, traffic sign recognition, front and rear parking aids, and trailer stability assist (TSA).

Don’t forget the Discovery’s terrain response system, and front and rear diff-locks.

As with all Mercedes-AMG models, the GLS63 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 GLS63’s service intervals are relatively long, at every 12 months or 20,000km (whichever comes first). Better yet, it’s available with a five-year/100,000km capped-price servicing plan, but it costs $4450.

The Discovery has a five year/unlimited km warranty with five years roadside assistance.

The service plan applies over five years/130,000km (whichever occurs first) with a cost of $2650.