ok... I used to own one of R33 GTS-4
Its Great car to move around but... its missing a turbo.
if you want to fully RWD than stick with R33 GTS you will have more power due to no 4WD train.
R33 GTS-4 is heavier and less powered
If you live where high rainfall like QLD. then its very useful in the winter and rainy days.
if you are into drifting then stick with GTS RWD.
also it cost arms and legs for conversion, but it can be done