Buick Regal Sportback (2020) is 10 mm (0.39 inch) wider and 75 kg (165 lbs) lighter than Cadillac XTS (2015).
Cadillac XTS (2015) is 232 mm (9.13 inch) longer, 46 mm (1.81 inch) higher and has 39 liters (1.38 ft3) bigger cargo space than Buick Regal Sportback (2020).