Mercedes M-Class (2014) is 132 mm (5.20 inch) higher, 410 kg (904 lbs) lighter and has 152 liters (5.37 ft3) bigger cargo space than Rolls-Royce Phantom (2018).
Rolls-Royce Phantom (2018) is 1185 mm (46.65 inch) longer and 91 mm (3.58 inch) wider than Mercedes M-Class (2014).