2021 BMW X3 vs 2021 Mercedes-Benz GLS

The 2021 Mercedes-Benz GLS, a continuation of the third generation introduced in 2020, was a luxurious SUV that evolved from the original GL-Class. Initially intended to replace the G-Class, the GLS instead found its niche among affluent families seeking a spacious, comfortable alternative to the likes of the Navigator and Escalade. The GLS featured a sleek design with softened angles, making it appear less bulky than its predecessors. Inside, it boasted a futuristic cabin dominated by a massive digital screen, emphasizing its tech-centric nature. Available in three trims—GLS 450, GLS 580, and the high-performance AMG GLS 63—the GLS offered a range of standard features, including remote keyless entry, nine USB ports, and a 13-speaker Burmester sound system. Various option packages allowed for further customization, adding features like ventilated seats and rear-seat controls.

The 2021 BMW X3, part of the third generation launched in 2018, received updates in 2020, including a plug-in hybrid model and M performance variants. This generation marked a significant refinement in the X3's design, offering a luxury level of refinement akin to larger BMW models. The X3's exterior resembled a downsized X5, while its interior maintained BMW's signature mechanical styling, prioritizing functionality over aesthetics. The 2021 X3 was available in several trims, including the sDrive30i, xDrive30i, M40i, and the xDrive30e plug-in hybrid. Standard features included 18-inch alloy wheels, a 10.2-inch infotainment system, and tri-zone climate control. Optional packages added amenities like genuine leather upholstery and a panoramic sunroof, with the M40i trim offering additional performance-oriented features.

The 2021 Mercedes-Benz GLS offered a range of powerful engines. The entry-level GLS 450 featured a twin-turbocharged 3.0-liter inline-six engine, producing 362 horsepower and 369 pound-feet of torque. The GLS 580 upgraded to a twin-turbocharged 4.0-liter V8, delivering 483 hp and 516 lb-ft. Both models utilized a nine-speed automatic transmission and Mercedes' 4MATIC all-wheel drive system. The AMG GLS 63, with its hand-crafted 4.0-liter twin-turbo V8, generated an impressive 603 hp and 627 lb-ft of torque, achieving 0-60 mph in just 4.1 seconds. All engines included Mercedes’ EQ Boost 48-volt mild-hybrid system, enhancing performance and efficiency. The GLS 63 featured an adaptive air suspension system, offering adjustable ground clearance and precise cornering capabilities. Multiple drive modes allowed for customization of throttle response, transmission mapping, and suspension stiffness, providing a dynamic driving experience.

The 2021 BMW X3 offered a variety of powertrains to suit different driving preferences. The sDrive30i and xDrive30i were equipped with a turbocharged four-cylinder engine, producing 248 horsepower and paired with an eight-speed automatic transmission. The sDrive30i featured rear-wheel drive, while the xDrive30i offered all-wheel drive. The xDrive30e plug-in hybrid delivered 288 hp and a 17-mile electric-only range, with recharging options for both 240-volt and 120-volt outlets. For those seeking enhanced performance, the M40i trim featured a 382-hp twin-turbo inline-six engine, providing robust acceleration and responsive handling. The X3 M performance model, with 473 hp, catered to drivers desiring a high-performance SUV experience.

The 2021 Mercedes-Benz GLS excelled in interior space, offering three rows of seating with ample headroom and legroom for first- and second-row occupants. Standard seven-passenger seating could be reduced to six with optional second-row captain’s chairs. The third row, while less spacious, accommodated full-size adults comfortably. The GLS provided 17.4 cubic feet of cargo space behind the third row, expanding to 42.7 cubic feet with the third row folded, and 87.4 cubic feet with both the second and third rows down. The power-folding third row and numerous storage compartments added to its practicality.

The 2021 BMW X3 offered impressive cargo space for a small luxury SUV, with up to 62.7 cubic feet available when the rear seats were folded, and 28.7 cubic feet with the seats in use. A power liftgate was standard, with a hands-free option available. The X3 provided ample space for passengers, with a comfortable front row and adult-friendly rear seats. The interior featured real buttons and dials, complementing the main touchscreen and simplifying operation for drivers and passengers alike.

The 2021 Mercedes-Benz GLS featured the MBUX infotainment system, with a large touch screen and a trackpad for navigation. It included Apple CarPlay and Android Auto, though a USB-C cable was required for connection. The MBUX system's voice-control feature allowed for complex commands, enhancing convenience. The digital dash extended to the instrument panel, both controlled by touch-sensitive pads on the steering wheel, offering customizable display options.

The 2021 BMW X3 came standard with a 10.2-inch touchscreen running the iDrive infotainment system, known for its user-friendly interface. The system combined touch operation with an iDrive dial, catering to different user preferences. Apple CarPlay was standard, while Android Auto was optional. Additional options included wireless device charging, a digital instrument panel, and a 16-speaker Harman Kardon stereo system. Gesture control was also available, allowing for basic controls through hand movements.

The 2021 Mercedes-Benz GLS came equipped with numerous driver-assistance features, including Active Brake Assist, forward-collision avoidance, and blind-spot monitoring. Additional safety features included automatic parking assist, a surround-view camera, and crosswind assist. Optional safety technologies included lane-keep assist, adaptive cruise control, and stop-and-go cruise control.

The 2021 BMW X3 offered standard safety features such as automatic emergency braking, forward collision warning, and lane departure warning. It also included blind-spot monitoring and rear cross-traffic alert. Optional safety features included adaptive cruise control, automatic high beams, and a head-up display.