Suggested by Sonic Ego is a powerful planet that has gone up against Thor and Galactus in the past. His abilities can’t be underestimated but I don’t see him winning this one. As Onslaught Professor X was able to easily defeat both the Hulk and Juggernaut as well as take out a large portion of Marvel’s fighters. Additionally Professor X once gained the powers of the Phoenix. Albeit temporarily and only a fraction of the full Force but he’s certainly been around the block. Ego will have a hard time keeping up. Professor X wins.