BMW 3 Series Gran Turismo (2014) is 53 mm (2.09 inch) higher, 7 kg (15 lbs) lighter and has 50 liters (1.77 ft3) bigger cargo space than Buick Regal Sportback (2020).
Buick Regal Sportback (2020) is 76 mm (2.99 inch) longer and 34 mm (1.34 inch) wider than BMW 3 Series Gran Turismo (2014).