I like the GameCube and PS2 equally. I mean, they both have my favorite game series on it (Final Fantasy, Zelda, Resident Evil, and of course Pokemon XD)!
As for GameCube... Not all the games on it are aimed for children. Resident Evil 0 and 4 are aimed at much more mature audiences (Plus they're GameCube-exclusive), and so is Metroid Prime, despite its "T" rating. I can tell ya this; The areas with the Shadow Pirates spooked me out. I didn't know what to do until I tried out the Thermal Visor... ^^;
And just think... in 1 year, I'll be old enough to buy the RE games legally! ^^