Mercedes A-Class (2017) is 140 mm (5.51 inch) higher, 10 kg (22 lbs) lighter and has 179 liters (6.32 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 86 mm (3.39 inch) longer and 20 mm (0.79 inch) wider than Mercedes A-Class (2017).