Cadillac ATS (2016) is 233 mm (9.17 inch) longer and 58 kg (128 lbs) lighter than Mercedes GLA-Class (2018).
Mercedes GLA-Class (2018) is 28 mm (1.10 inch) wider, 191 mm (7.52 inch) higher and has 54 liters (1.91 ft3) bigger cargo space than Cadillac ATS (2016).