Well after trying both, the GC controll is excellent (except for that tiny and useless dpad).
No one can help you with your decision, really because it is a matter of taste.
Personally, after witnessing the n64 debacle, and a pretty lackluster launch, the GC is off my radar right now. You could name titles like Mario, Metroid and Zelda, but I was seriously underwhelmed with the N64 and N\'s first party titles (after launch). I\'m going to wait and see (and probably never own that cute little purple box--man is it small!!).
The xbox has a few titles that interest me with Halo leading the way. If it weren\'t for Halo I\'m not sure I\'d be that psyched for the xbox. DOA3 looks good, but I do prefer 2d fighters (although if I get an xbox I\'ll eventually get it). Other than that, I\'d pick up NHL 2002 (I know it\'s for every system).
For me, PC gaming is a wonderful thing--deep, meaningful and serious. That\'s why the xbox is a breath of fresh air for me. Console game are console games--I\'ve been playing them since Atari 2600, but the xbox is a shift in perspective, sure it\'ll have console-ish games and I\'ll play a great number of them, but why not get the best of both? Those are my views.