Who would win in a fight: Gandalf or Dumbledore?

[blackmage_nuke]

Gandalf barely displayed any powers, but Dumbledore probably wasn't in peak fighting condition by the time the books started and Gandalf seems to have a lot more energy so if were basing this as generally throughout scope of the story Gandalf might have a chance if there's some hidden power he has not fully displayed, but I think if Gandalf at any time were to fight Dumbledore after he fought Grindewald and before Voldemort, Dumbledore would win.

It also depends if this is a fight to the death because I don't think Dumbledore would be willing to kill Gandalf, I cant see him murdering just for the sake of a fight since he prefers non-lethal methods unless his opponent is unquestionably going to murder a lot of people, whereas I can see Gandalf not blinking an eye and snuffing out Dumbledore.