Two Coupes with more similarities, such as the body structure, market segment, starting price, ground shadow size, and height, than differences, like the modifications, horsepower, fuel economy, and maximum occupancy. First of all, the 2016 Mercedes-Benz AMG GT has a more powerful engine than the 2015 Porsche 911 Coupe GT3, but it gets 1 more mile on a gallon of fuel. Also, the 2015 911 Coupe GT3 seats two more passengers than the 2016 AMG GT. Among similarities are the body structure, market segment, starting price, ground shadow size, and height.