Two SUVs with some similarities, but otherwise different in most aspects such as the model year, starting price, horsepower, fuel economy, and height. First of all, there is a notable difference in the starting price of the 2016 GMC Acadia, which is $6,615 less than the base MSRP of the 2014 Nissan Armada, which is two model years older. Also, the 2014 Armada has a more powerful engine than the 2016 Acadia, and it gets 3 fewer miles on a gallon of fuel. And finally, the Acadia is slightly shorter than the Armada. Among similarities are the body structure, ground shadow size, and maximum occupancy.