I mean, it's obviously Xavier. Just because he understands the machines are destined to win because mutants are better, doesn't mean he's willing to forsake everything. After all, Namor straight up pointed it out that Xavier doesn't really believe he's better. I mean he's:
* A douche like Xavier
* Still (mostly) a pacifist
* Still gives Magneto a million chances
* Still believes in his dream (even if he knows it can never be real now)
But most importantly: HE BALD