BMW X1 (2018) is 143 mm (5.63 inch) higher, 230 kg (507 lbs) lighter and has 35 liters (1.24 ft3) bigger cargo space than Buick Regal Sportback (2019).
Buick Regal Sportback (2019) is 461 mm (18.15 inch) longer and 41 mm (1.61 inch) wider than BMW X1 (2018).