Buick Regal Sportback (2018) is 490 mm (19.29 inch) longer, 28 mm (1.10 inch) wider and has 35 liters (1.24 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 156 mm (6.14 inch) higher and 179 kg (395 lbs) lighter than Buick Regal Sportback (2018).