Well, I do have definate favorites in the consoles, but
I try not to be a geek about it. If someone asks what I have, I'll tell him. If he asks which one to get, I'll tell him what I like and what I think makes it good (or makes the other one bad). After that, I don't care.

I like sony better because it has more variety in the games. They have more platformers and rpgs and fewer shooters and sports games. My biggest complaint of xbox is that it has mostly shooters and sports games, and that there really isn't much else (unless you are into online play, which I'm not particularly). That doesn't make xbox trash. Heck if that's the kind of stuff you love to play, and you live for online gaming, Sony would be a bad choice for you. Gamecube is kind of a different case, because nintendo has made some weird games for gamecube, and if you aren't into that kind of weird, nintendo isn't for you.

With handheld game systems again I tend to lean sonyward (haven't bought one yet) because I've just not seen anything great on DS, and the Duel Screen concept just doesn't seem appealing. PSP looks great and hopefully will have some great games soon. GBA might be good too.