I had a GameCube first, then a PS2 (well... you could count Dreamcast as very first).
I mostly played with my Gamecube though. The proof is that I actually bought 2 because my first one stopped reading discs! Melee, Metroid Prime, Star Fox, Ikaruga, etc., they were all the sheit! =P
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...