He defeats them all. The only exception could be Cyttorak. Galactus wasn't entirely convincing when he, Strange, Nova, and SS traveled through Cyttorak's realm but he again didn't directly confront Cyttorak, unlike his confrontation with Agamotto. That has more to do with the context of the plot, as the entire group was trying to discover the hiding place of the Magus (read: Galactus was in a hurry, and deemed Strange et. al expendable when they were trapped by Cyttorak).
I maintain the edge to Galactus because Cyttorak simply doesn't have the feats. He rendered Strange utterly powerless in the Crimson Cosmos but that has zero correlation to Galactus since Galactus is not a being of mystical energy.