GMC Sierra 3500HD (2014) is 523 mm (20.59 inch) longer, 3 mm (0.12 inch) wider, 54 mm (2.13 inch) higher and has 578 liters (20.41 ft3) bigger cargo space than Nissan Armada (2018).
Nissan Armada (2018) is 90 kg (198 lbs) lighter than GMC Sierra 3500HD (2014).