
The Mercedes-Benz GLS is relatively straightforward to comprehend. For many years, the S-Class—the flagship sedan of Mercedes-Benz— has served as an iconic symbol, embodying automotive luxury and setting the benchmark for all luxury automobiles. However, over the past four decades, consumer preferences have shifted, with many individuals favoring SUVs even in the realm of high-end luxury vehicles. Consequently, the GLS can be regarded as the SUV equivalent of the S-Class. Naturally, it is more than merely an S-Class with a long roof. The GLS is specifically engineered for its intended purpose, incorporating the confidence-inspiring capabilities of all-wheel drive for both on-road and off-road conditions. As the largest Mercedes-Benz SUV, it also offers three rows of seating.
The GLS model lineup comprises two engines, each available in two configurations. The GLS 450 features a 3.0-liter turbocharged inline-six engine with a 48-volt mild hybrid arrangement generating 375 horsepower and a maximum torque of 369 lb-ft at 1600 rpm. The GLS 580 is equipped with a 4.0-liter turbocharged V8 engine that delivers 510 horsepower and a peak torque of 538 lb-ft at 2,600 rpm. Lastly, the AMG® GLS 63 employs the same core engine as the GLS 580; however, it is meticulously hand-assembled by a single master engine builder and features increased turbo boost, producing 603 horsepower and 627 lb-ft of torque at 2500 rpm. All engines are coupled with a nine-speed transmission that sends power to all four wheels via the sophisticated 4MATIC® all-wheel-drive system.
Unsurprisingly, the GLS was never going to have this market segment by itself. The Land Rover Range Rover precedes every and has moved steadily upmarket. The BMW X7 positions itself in the sporty territory among these very large vehicles. The Cadillac Escalade has made a name for itself in the U.S. while very effectively masking its pickup truck core, and the Audi Q9 debuts for the 2027 model year, supplanting the long-running Q7 as the brand’s flagship SUV.

Similarly to Mercedes-Benz, BMW employs the number “7” in its flagship SUVs to denote that, paralleling the 7-Series sedan, this model epitomizes the zenith of the brand’s SUV hierarchy. Introduced in the 2019 model year, it is still in its original design. Although the X7 is praised for its agility relative to its size, it is worth noting that, as with all vehicles in this segment, its dimensions may discourage aggressive testing of its limits. The X7 is equipped with three rows of seating and is built on an extended version of the X5 platform, and features standard all-wheel drive (AWD), self-leveling air suspension, and a dual-wishbone suspension up front complemented by a multi-link configuration in the rear.
The base X7 xDrive40i model is powered by a 3.0-liter turbocharged Inline-6 engine with a 48-volt mild hybrid system that delivers 375 horsepower and 398 lb-ft of torque, while power is routed to all four wheels through an eight-speed automatic transmission. The M60i variant goes its own way with a 4.4-liter twin-turbocharged V-8 engine producing 523 horsepower and 553 lb-ft of torque.
Here are some of the advantages of the GLS over the X7:

With lineage dating back to 1970, the Range Rover can lay claim to being the progenitor of the luxury SUV segment. While the earliest models were still somewhat spartan, today’s fifth-generation Range Rover is unquestionably a luxury vehicle through and through, and carries a base price to match. Two wheelbase lengths are available, with the longer variant providing space for a third-row seat and directly competing with the GLS. Three drivetrain options are offered. The first is a 3.0-liter turbocharged inline-six producing 395 horsepower and 406 lb-ft of torque. This engine also underpins a plug-in hybrid variant, which can operate on electricity alone for up to 50 miles and is rated at 543 horsepower and 590 lb-ft of torque. Additionally, a BMW-sourced 4.4-liter V8 engine is available, delivering either 523 or 607 horsepower with 553 lb-ft of torque, depending on trim level. All options are equipped with an 8-speed automatic transmission, and four-wheel drive is standard.
The advantages of the GLS over the Range Rover include:

The Audi Q9 is entirely new for the year 2027. It supersedes the Q7 as Audi’s flagship SUV, although it is constructed on an enlarged version of the same platform. Featuring a 123.5-inch wheelbase, it is directly aimed at competitors such as the GLS and X7. However, unlike these models, it is equipped with twin turbochargers for its standard 2.9-liter V6 engine, complemented by a proprietary 48-volt hybrid system, resulting in 429 horsepower and a peak torque of 442 lb-ft at 2000 rpm. This places its power output approximately between the base and upgraded engines of both the GLS and X7. For those willing to incur a six-figure expenditure, there exists the high-performance SQ9, which boasts a twin-turbocharged 4.0-liter V8 engine generating 591 horsepower and a peak torque of 590 lb-ft at 2400 rpm. Both engines are linked to an 8-speed automatic transmission, with all-wheel drive being standard.
In contrast to the Q7, the Q9 is specifically designed to accommodate a third row of seating, offering configurations for six and seven occupants. It also matches the GLS in its towing capacity of 7,700 pounds and comes equipped with a standard air suspension. The vehicle features numerous dashboard screens and several technologically advanced features exclusive to Audi, including electronically operated doors and a hands-free highway driving system.

Although it shares its roots with other General Motors full-size pickup and SUV offerings, the Escalade represents the biggest, boldest, and most luxurious option in the automaker’s lineup.
The size of the Escalade is a significant distinctive feature, with the longest models in these comparisons measuring 211.9 inches in length, extending to 227 inches for the Escalade ESV. Escalade also boasts the largest cargo capacity, which is further increased in the ESV variant. The engine is also sizable, featuring a standard 6.2-liter V8 that delivers 420 horsepower and 460 lb-ft of torque. The performance-oriented Escalade-V is equipped with a supercharged version of the same engine, producing 682 horsepower and 653 lb-ft of torque. Both engine options are paired with a 10-speed automatic transmission, with power sent to either a rear-wheel-drive system or a full-time all-wheel-drive system. The previously available 3.0-liter turbodiesel six-cylinder engine has been discontinued.
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| Full-Size Luxury Crossover SUV | Mercedes-Benz GLS | BMW X7 | Range Rover | Audi Q9 | Cadillac Escalade |
|---|---|---|---|---|---|
| Trims | 3 | 2 | 4 | 3 | 5 |
| Colors | 22 | 18 | 10 | 7 | |
| Engine | 3.0-liter Turbo I-6 Mild Hybrid, 4.0-liter twin-turbo V8 mild hybrid, 4.0-liter twin-turbo V8 hybrid |
3.0-liter Turbo
4.4-liter Turbo
|
3.0-liter Turbo I-6
3.0-liter Turbo I-6 PHEV
4.0-liter Turbo V8
|
2.9-liter T-Turbo V6 | 6.2-liter |
| Horsepower |
3.0T: 375
4.0T: 510
AMG: 603
|
3.0L – 375
4.4L – 523
|
3.0T: 395
PHEV: 543
4.4T: 523 – 607
|
429 |
420
V: 682
|
| Torque |
3.0T: 369 @ 1600
4.0T: 538 @ 2600
AMG: 627 @ 2500
|
3.0L – 398
4.4L – 553
|
406 @ 2000
PHEV: 590
4.4T: 533
|
442 @ 2000 |
460 @ 4100
V: 653
|
| Transmission | 9-Speed Automatic | 8-speed auto | 8-speed auto | 8-Speed Automatic | 10-speed auto |
| DriveTrain | AWD | AWD | AWD | AWD | 2WD, 4WD |
| Towing Capacity | 7,700 lbs. | 7,500 lbs. | 7,715 lbs. | 7,700 lbs. | 8,100 lbs. |
| Fuel Economy (Hwy/City/Comb) |
3.0T: 19 / 24 / 21
4.0T: 14 / 20 / 16
|
3.0L – 20 / 24 / 22
4.4L – 16 / 20 / 18
|
3.0T: 19 / 24 / 21 | 6.2L – 15 / 19 / 17 | |
| Infotainment | 12.3″ | 14.9″ | 13.1″ | 14.5″ | 17.7″ |
| Front Headroom | 39.4″ | 41.9″ | 39.3″ | 39.1″ | 42.3″ |
| Front Legroom | 40.3″ | 39.8″ | 39.9″ | 41.5″ | 44.5″ |
| 2nd Row Headroom | 40.2″ | 39.9″ | 39.2″ | 40″ | 38.9″ |
| 2nd Row Legroom | 41.9″ | 37.6″ | 40.4″ | 41.6″ | 42″ |
| 3rd Row Headroom | 38.9″ | 36.6″ | 35.8″ | 39.8″ | 38.2 |
| 3rd Row Legroom | 34.6″ | 33.3″ | 35.8″ | 29.1″ |
34.9
ESV: 36.7
|
| Cargo Space Behind 3rd Row Seats (cubic feet)17. | 17.4 | 11 | 19.3 |
25.5
ESV: 41.5
|
|
| Cargo Space Behind 2nd Row (cubic feet) | 42.7 | 48.6 | 43.1 | 43.8 |
72.9
ESV: 94.1
|
| Cargo Space Behind 1st Row (cubic feet) | 84.7 | 90.4 | 92.9 | 87.7 |
120.5
ESV: 142.2
|
| Base Price | $90,250 | $87,500 | $120,700 | $87,700 | $91,100 |
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