Two Pickups with some similarities, but otherwise different in most aspects such as the horsepower, model year, ground shadow size, height, and maximum occupancy. First of all, the 2014 Sierra 1500 Regular Cab has a more powerful engine than the 2016 Tacoma Double Cab. Also, the Sierra 1500 Regular Cab is both slightly larger and taller than the Tacoma Double Cab. In addition, there is a difference in the number of passengers; the GMC Sierra 1500 Regular Cab seats one more the Toyota Tacoma Double Cab. Among similarities are the body structure, starting price, and fuel economy.