My favorites, in order:
GameCube: This is the only current console I have! I don't care what people say, the controller is GREAT to use, and the games are better than any on any other system.
PS2: I do have a soft spot for this project, mainly because Katamri was released for it. It has it's share of neat games, and a very innovative controller.
XBox: I HATE MICROSOFT. I'm serious. Their OS sucks. Although I have to admit their console is a little better, it's not by much. The system is entirely overrated. And I don't like the controller at all. Plus, I'm not a Halo fan. AT ALL.