BMW X5 (2016) is 123 mm (4.84 inch) wider, 299 mm (11.77 inch) higher and has 180 liters (6.36 ft3) bigger cargo space than Buick Regal Sportback (2018).
Buick Regal Sportback (2018) is 20 mm (0.79 inch) longer and 608 kg (1,340 lbs) lighter than BMW X5 (2016).