I have a 2002 1.8T quattro version.
I would like a non turbo engine but still like to drive a sporty car. The 1.8T engine has lots of issues including oil sludge and gasket oil leaks. In addition, the quattro system eats tires or as the dealer says, it may be my driving style.
I like to drive and not just in a straight line. Handling is important to me more so than engine output.
The 350Z seems to have both handling, power, and looks but I am not sure about the quality of Nissan products.
The 350Z and TT are both 2-door hatchbacks but totally different personalities. The 350Z is more of a muscle car that can handle while my TT is more nimble and use boost=lag.
Yes, the TT and Beetle share the same platform. The Beetle does not have quattro system although VW did make a superBeetle basically a TT with Beetle body.