When it comes to their driving characteristics, the Audi TTS and Alfa Romeo 4C don't have much in common. The TTS is quiet, refined and has daily usability. The 4C, however, is the exact opposite, and yet it'd be the one we'd prefer to own. So why doesn't this Motor Trend comparison test feature a duel between the TTS and the Porsche Cayman? Because, simply put, they're no longer direct rivals. Perhaps they never were. Look, the TTS, at its core, is a VW Golf. Same platform. The Cayman has always been its own unique thing.