Well, as an R33 (GTS-T) owner, I'll try to be as unbiased as possible here.
When I was deciding which car to buy I was looking into S13 180SX (I came 24hours too late for a beautiful white 1996 180SX, FFS - BRIDE SEATS!), the R32 and R33s. Apart from liking the R33s looks - though I also like the R32s - I couldn't justify putting the 18k or so down on a 1990 model car when I could pay roughly the same for a much newer 1996 model. Now, I know the age doesn't determine everything with a car and it's possible that I could pickup a 1996 peice of shit when I could have collected a well looked after 1990 model. But, being me (IE, not exactly a mechanic), I sure as hell wouldn't want to be forking out $$$ to fix broken gear-boxes etc. So, when I continued to see 1990 R32s with 80,000kms and 1996 models with 80,000kms I made sure I stayed well clear of them.
Other than that, I like the interior of the S2 R33s, the additional features - dual air bags. On top of that, the handling isn't bad - perhaps not as good as the nimbler R32s, and the R33s are faster - ever so slightly. So, all in all, both seemingly in the same price bracket, the R33 offers (for me atleast) and far more complete package.