Audi S6 (2014) is 31 mm (1.22 inch) longer and 12 mm (0.47 inch) wider than Buick Regal Sportback (2019).
Buick Regal Sportback (2019) is 15 mm (0.59 inch) higher, 195 kg (430 lbs) lighter and has 71 liters (2.51 ft3) bigger cargo space than Audi S6 (2014).
