BMW X6 (2014) is 9 mm (0.35 inch) longer, 127 mm (5.00 inch) wider, 234 mm (9.21 inch) higher and has 110 liters (3.88 ft3) bigger cargo space than Buick Regal Sportback (2019).
Buick Regal Sportback (2019) is 640 kg (1,411 lbs) lighter than BMW X6 (2014).