R33 GTR -
The R34 GTT is a very nice looking car and performs well. If you want a hot street car it would be a good choice.
If you want a performance car, with the exception of drifting, the R33 beats the GTT hands down in every way. It has arguealby the best twin turbo six ever build (RB26DETT), its handling is out of this world between a stiff suspension and Atessa, and lots of other things simply makes the GTR a much better car. Keep in mind though upkeep is not cheap and if it breaks it will cost more to fix.