GMC Sierra 3500HD (2017) is 423 mm (16.65 inch) longer, 21 mm (0.83 inch) wider, 16 mm (0.63 inch) higher and has 578 liters (20.41 ft3) bigger cargo space than Nissan Armada (2015).
Nissan Armada (2015) is 325 kg (717 lbs) lighter than GMC Sierra 3500HD (2017).