GMC Terrain (2021) is 290 mm (11.42 inch) longer, 45 mm (1.77 inch) wider, 190 mm (7.48 inch) higher and has 1371 liters (48.42 ft3) bigger cargo space than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 353 kg (778 lbs) lighter than GMC Terrain (2021).