I prefer the GC controller, probably because i'm so used to it.
Also, who would have a PS2? Try 150 million people, it's one of the best selling consoles of all time. It still has a better library of games than most modern consoles, especially the Wii, which has like ten good games, and a hell of a lot of shovelware. It also has incredible graphics for it's time, and can still stand up to some modern titles (unlike the N64, which, despite the love I have for it, does look pretty dated in comparision, but that's a different matter).
The controller does kinda suck though, i'll give you that.