im sure this topic will be pretty biased.. but here goes:
i would choose the 33 s2 simply because its newer, more powerful, bigger turbo, may have less km's, mild mods will see it with some pretty good numbers...ect ect..
realistically, you need to choose what you like, some people absolutly hate the look of 33's, while others hate 32s. regardless of that, the way i look at it, the newer more modernised updated version is ussually the winner.
of course people will argue against it, so the best influence and decision is your own.
also list some specs about both cars. i.e what year, current mods, future mods, kms, ect.. that will then make better opinions than just whats better a 32 or 33.
good luck and welcome!