Tough call that one. Everyones got their preferences and as far as looks are concerned that's something you've got to decide for yourself.
On "paper" both the R33 GTR and the R34 GTT put out the same power, so there's not a lot between them in the power department.
Most people are gonna say go the GTR because, well - it's a GTR!
With the GTR's you'll get what is considered a stronger engine, plus the ATTESSA torque split system. You'll also be getting an older car, with higher KM's and an older design. Personally I like the feel of the R34's - they seem much smaller than the R33 series, particularly inside. R34's have the more modern interior and the updated RB engines with improved torque output over earlier RB's. Handling, well my R34 handles pretty well but I've never driven an R33 GTR at speed so I can't really compare. Both cars have HICAS, LSD's, sway bars etc and both have 17inch alloys as standard.
If drifting is what you're wanting to do, then perhaps the RWD GTT would be the wiser choice.
Probably the best advice is to test drive both and see what you think!
Dave