<< From what I can see Yoda has no form of attack...don't believe I've ever seen him brandish a lightsaber. And we all know Gandalf can kick ass...so reluctantly I must go with Gandalf. >>
He's supposed to fight in one of the prequels. I'm not sure if it's in AToC or Ep3 though. I think one of the CD covers for the soundtrack has Yoda holding a ball of force lighting, but I'm not sure if he actually uses it. I also read something a few months back that they were researching a double sabre fighting technique, only using short sabres (like the sai fights in The Mummy Returns) for Yoda, as apparently he uses a unique style (as all the jedi do).