When it comes to purchase price, the Audi TT S is slightly cheaper than the Porsche 718 Cayman and the Alpine A110, but it’s considerably pricier than BMW’s M240i. And although Audis generally have good resale value, the TT won’t hold onto its worth nearly as well as the Porsche or the Alpine. While the BMW will be worth less in absolute terms down the line, it’ll likely hold on to a higher percentage of its purchase price. This means that while the TT S is very competitive in terms of fuel economy, servicing costs and the like, it’ll likely cost more than its rivals to run over your whole time with it.