GMC Sierra 2500HD (2018) is 424 mm (16.69 inch) longer, 21 mm (0.83 inch) wider, 15 mm (0.59 inch) higher and has 305 liters (10.77 ft3) bigger cargo space than Nissan Armada (2015).
Nissan Armada (2015) is 215 kg (474 lbs) lighter than GMC Sierra 2500HD (2018).