GMC Sierra 3500HD (2015) is 394 mm (15.51 inch) longer, 6 mm (0.24 inch) wider, 26 mm (1.02 inch) higher and has 578 liters (20.41 ft3) bigger cargo space than Nissan Armada (2018).
Nissan Armada (2018) is 174 kg (384 lbs) lighter than GMC Sierra 3500HD (2015).