GMC Sierra 2500HD (2014) is 439 mm (17.28 inch) longer, 18 mm (0.71 inch) wider, 393 kg (866 lbs) lighter and has 305 liters (10.77 ft3) bigger cargo space than Nissan Armada (2014).
Nissan Armada (2014) is 12 mm (0.47 inch) higher than GMC Sierra 2500HD (2014).