Mercedes M-Class (2015) is 100 mm (3.94 inch) higher, 35 kg (77 lbs) lighter and has 20 liters (0.71 ft3) bigger cargo space than Porsche Cayenne (2017).
Porsche Cayenne (2017) is 51 mm (2.01 inch) longer and 28 mm (1.10 inch) wider than Mercedes M-Class (2015).