I got an r32 gtr after 5 cossies, I broke that for parts then bought another r32 gtr which I still have and I also bought an r33 gtr which overall is the best car ive ever had to date.
it all depends what your after from the car, if your looking for lots of power and 4x4 a cossie is no match for a gtr's drivetrain but gtr's are abit of a twat to work on whereas cossies aren't there much more acsecable.
I loved all my cossies I will never forget my first passenger ride was in a stage 3 saph and I was blown away by it I must of been about 20, its just once you want to get past 500 hp imo they are done as none of the drivetrain can cope, I know it can all be upgraded (£££££) but why bother when a better platform is available with a gtr or a supra if rwd.