On most normal days driving you can only go as fast as the car in front. Not a lot you can do about traffic!
I'm not a fan of the TT either due to its looks. It reminds me of the VW Beetle but a bit smaller!
Someone I work with just got a new TT and he loves it. It does have its plus point like back seats his small kids can fit in, but I don't have a family yet so no need for them. Everyone has different taste but as far as performance goes there isn't much between them to really worry about. I looked at the 350z but it doesn't have the comfort and on a long drive for 2 hours to a customer meeting, I chose comfort over the extra performance. We all have different needs and desires even though we are all looking at cheap sports cars.