Mercedes A-Class (2014) is 138 mm (5.43 inch) higher, 46 kg (101 lbs) lighter and has 191 liters (6.75 ft3) bigger cargo space than Porsche 718 Cayman (2017).
Porsche 718 Cayman (2017) is 100 mm (3.94 inch) longer and 21 mm (0.83 inch) wider than Mercedes A-Class (2014).