Definatly the revolution, I know I am a fan of nintendo but I have to pick this cuz simply it will be the only next gen console to have a zelda game on it and for nintendos innocative gaming style. Imagine swinging the controller around and link perfectly copying your graceful (or drunken like) sword movements. That new controller should open up new gaming opportunities, but will games developers be able to truly use the hardware as well as nintendo can is yet to be seen.
But to go along with my revolution I would have to pick the xbox.