I played KOTOR once mac native, worked ok, I think from memory there was one crashy part but there was a workaround, after that it was fine.
I much later played KOTOR and KOTOR II via bootcamp with no problems. If you have bootcamp set up already I'd suggest that. Apart from any other considerations, there are fan-made patches around which fix dialogue bugs etc etc which are handy.
They are fantastic games, definitely worth playing!
You should note if you haven't already that KOTOR II was released unfinished - for me at least, the climax was a real disappointment (after how great KOTOR and the buildup in KOTOR II was). So brace yourself for that. Still definitely worth playing though, you just have to imagine what it might have been. Sigh.
Wish they would do a Mass Effect-grade KOTOR III rather than this massively multiplayer stuff.