Two Coupes with some similarities, but otherwise different in most aspects such as the horsepower, starting price, fuel economy, and ground shadow size. First of all, there is a $4,905 difference in the base MSRP. The 2016 Audi TT Coupe has a higher starting price than the 2015 Cadillac ATS Coupe. Also, the 2015 ATS Coupe has a more powerful engine and gets 3.5 mpg less than the 2016 TT Coupe. And finally, the TT Coupe is slightly smaller than the ATS Coupe. Among similarities are the body structure, market segment, height, and maximum occupancy.