Two Pickups with some similarities, but otherwise different in most aspects such as the model year, horsepower, starting price, and height. First of all, there is a notable difference in the starting price of the 2013 GMC Sierra 1500 Extended Cab, which is $7,675 less than the base MSRP of the 2016 Nissan Titan XD, which is three model years newer. Also, the 2016 Titan XD pulls more horsepower than the 2013 Sierra 1500 Extended Cab. And finally, the roofline of the Sierra 1500 Extended Cab is slightly lower than the Titan XD's. Among similarities are the body structure, ground shadow size, and maximum occupancy.