GMC Sierra 3500HD (2015) is 424 mm (16.69 inch) longer, 21 mm (0.83 inch) wider and has 578 liters (20.41 ft3) bigger cargo space than Nissan Armada (2015).
Nissan Armada (2015) is 10 mm (0.39 inch) higher and 314 kg (692 lbs) lighter than GMC Sierra 3500HD (2015).
