As an owner of both a 97 TT and an SPF they are both very different cars. The TT is fast and handles well at high speed and can be driven anywhere. The cobra is more exciting. It may not handle as well but I find it more fun to drive. When I go to the garage on a nice day I usually choose the Cobra. Don't choose the Cobra if you want to stay low key. Driving down a city street is like being in the Thanksgiving Day Parade. EVERYBODY LOOKS. The TT is recognized only by Porshephilles.
P.S Neither has much of a trunk
