Gandalf Vs. The Witch King

Originally Posted by Mansun

By the way, Eru himself increased Gandalf's power for good measure, with a prior knowledge of knowing what Sauron may do to increase the Witch King's power. With this in mind, Eru would not have left a debt in Gandalf's power versus the Witch King!

This qoute wins the argument in favour of Gandalf the White, & virtually proves that he would indeed be victorious against the Witch King in battle. Not that this counts too much in context with the film!