Buick Regal (2014) is 421 mm (16.57 inch) longer and 23 mm (0.91 inch) wider than Mercedes GLA-Class (2020).
Mercedes GLA-Class (2020) is 128 mm (5.04 inch) higher, 102 kg (225 lbs) lighter and has 33 liters (1.17 ft3) bigger cargo space than Buick Regal (2014).