I had a TT before I got my z so I think I can help with this. The TT was a great car, I never had any problems with it and their customer service was much better than nissan. They always came and picked up the car for oil changes or whatever and would drop off a new a4. They interior and overall quality was better on the TT. From the outside the z is much better looking, much more aggressive. I really got sick of girls saying how "cute" my TT was. The z is much more fun to drive and much better power. When I had my TT I always wanted a z. But if you buy the TT, I still have some nice wheels to sell you so I say buy the TT..=)