ok look, like a few others have said.... this thread will go on forever and then some if you keep asking short questions like that.
what do YOU as a person want??? you dont have to know every single inch of each engine or car to know what you want in the end, line up all 3 models and think about what most appeals to you looks wise, then look into engine capabilities if thats what you want the car for and then modding capabilities and so on.
R32 gts-t is an all round sports car ( even though im not a huge fan, its a known fact ), R33 is a good tourer and cruiser car above all else but still has sports car advantages, and 180's are primarily drifters..... go to any drift even and i garuantee you'll see more 180's, than most other cars.
anything else i havnt mentioned, someone else can fill in