Buick Regal Sportback (2020) is 483 mm (19.02 inch) longer, 58 mm (2.28 inch) wider and has 49 liters (1.73 ft3) bigger cargo space than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 39 mm (1.54 inch) higher and 347 kg (765 lbs) lighter than Buick Regal Sportback (2020).