Even though everyone will say Saitama; Guy's eighth gate of death makes him so powerful that he can bend matter and make punches with only the air faster than a minigun. He may not be able to destroy a planet like Saitama, but Guy trained longer and harder than Saitama did.
[spoiler]Also; people who call anyone who watches anime a weeaboo, [i]there's the door[/i]. Negativity doesn't help anyone.[/spoiler]
-
Saitama will destroy Naruto and every other ninja.