The ADX runs a 1.5-liter VTEC Turbo four making 190 horsepower and 179 lb-ft, with peak torque on tap from 1,700 to 5,000 rpm. A sport-tuned CVT with paddle shifters and Step Shift programming handles the gears, and all-wheel drive with Intelligent Control System is available on every trim.

The GLA 250's 2.0-liter turbo four makes 221 horsepower and 258 lb-ft, and a 48-volt mild hybrid system can add up to 13 horsepower electrically. An 8-speed dual-clutch automatic is standard. Mercedes also builds the 302-horsepower AMG GLA 35, but this comparison stays with the GLA 250 and GLA 250 4MATIC.

• Acura ADX: 190 hp and 179 lb-ft from a 1.5L VTEC Turbo
• Acura ADX: sport-tuned CVT with paddle shifters and Step Shift
• Acura ADX: EPA-estimated 26/31/28 mpg city/highway/combined with FWD
• Mercedes-Benz GLA 250: 221 hp and 258 lb-ft from a 2.0L turbo
• Mercedes-Benz GLA 250: 8G-DCT 8-speed dual-clutch automatic
• Mercedes-Benz GLA 250: EPA-estimated 26/34/29 mpg city/highway/combined with FWD

Every ADX trim gets a 9-inch color touchscreen with a physical volume knob, a 10.2-inch Acura Precision Cockpit digital instrument display, wireless Apple CarPlay and Android Auto, Wi-Fi hotspot capability and a 15-watt Qi wireless charger. Move up to the A-Spec with Advance Package for 15-speaker Bang and Olufsen audio, Google built-in and Alexa Built-in, and as of July 16, 2026, that trim also gains Google Gemini.

The GLA 250 starts with a 10.25-inch touchscreen, a 10.25-inch digital cluster, MBUX voice control and wireless smartphone integration. Wireless charging, navigation and a head-up display are added through optional trim packages.

• Acura ADX: 9-inch touchscreen with a physical volume knob
• Acura ADX: 15W Qi wireless charger standard on every trim
• Acura ADX: Google built-in and Gemini on A-Spec with Advance Package
• Mercedes-Benz GLA 250: 10.25-inch touchscreen and 10.25-inch digital cluster
• Mercedes-Benz GLA 250: MBUX voice control and a 115V household outlet
• Mercedes-Benz GLA 250: wireless charging through optional trim packages

The core of the ADX safety story needs no option box: Adaptive Cruise Control with Low-Speed Follow, Traffic Jam Assist, Lane Keeping Assist, Road Departure Mitigation, Blind Spot Information and Cross Traffic Monitor are all part of AcuraWatch on every trim. NHTSA rates the 2026 ADX five stars Overall with front-wheel or all-wheel drive.

On the GLA 250, Active Brake Assist, Blind Spot Assist with a safe-exit function and ATTENTION ASSIST are standard. Adaptive cruise, Active Steering Assist and Active Lane Keeping Assist are grouped in the optional Driver Assistance Package.

• Acura ADX: AcuraWatch standard, including adaptive cruise with Low-Speed Follow
• Acura ADX: Blind Spot Information and Cross Traffic Monitor on every trim
• Acura ADX: NHTSA 5-star Overall rating, FWD and AWD
• Mercedes-Benz GLA 250: Active Brake Assist and Blind Spot Assist standard
• Mercedes-Benz GLA 250: DISTRONIC adaptive cruise in the optional Driver Assistance Package
• Mercedes-Benz GLA 250: PARKTRONIC and Surround View in the optional Parking Package

The ADX and A-Spec hold 24.4 cubic feet behind the rear seats and 55.1 cubic feet with them folded, while the A-Spec with Advance Package lists 23.2 and 53.9. Every trim comes with heated front seats, two-zone automatic climate control and rear air vents; step up to either A-Spec and the front seats are ventilated as well.

Mercedes publishes a single cargo figure for the GLA 250: 50.5 cubic feet with the rear seats folded. Its cabin uses MB-Tex synthetic upholstery, power front seats with memory and 40/20/40 folding rear seatbacks, with heated front seats on the options list.

• Acura ADX: 24.4 / 55.1 cu ft of cargo space on ADX and A-Spec
• Acura ADX: heated front seats and dual-zone automatic climate standard
• Acura ADX: ventilated front seats on both A-Spec trims
• Mercedes-Benz GLA 250: 50.5 cu ft maximum cargo with rear seats folded
• Mercedes-Benz GLA 250: MB-Tex upholstery and 3-position memory front seats
• Mercedes-Benz GLA 250: 40/20/40 folding and reclining rear seats

The ADX stretches 185.8 inches on a 104.5-inch wheelbase and clears the pavement by 7.3 inches. The base ADX has a one-touch power moonroof and 18-inch wheels, both A-Spec trims move up to a panoramic moonroof and 19-inch wheels, and a power tailgate with Walk Away Close is standard. Double Apex Blue Pearl is new for 2026.

The GLA 250 measures 173.6 inches long on a 107.4-inch wheelbase. It comes on 18-inch wheels, with 19- and 20-inch designs offered through packages, and the Panorama roof is optional.

• Acura ADX: 185.8 inches long with 7.3 inches of ground clearance
• Acura ADX: panoramic moonroof and 19-inch wheels on A-Spec trims
• Acura ADX: power tailgate with Walk Away Close standard
• Mercedes-Benz GLA 250: 173.6 inches long on a 107.4-inch wheelbase
• Mercedes-Benz GLA 250: 18-inch wheels standard, 19- and 20-inch optional
• Mercedes-Benz GLA 250: Panorama roof optional