A shonen anime is incomplete without a cool sensei character. Satoru Gojo is the embodiment of cool. Not only is he nonchalant and eccentric, he actually is the strongest character of the Jujutsu Kaisen Universe. The protagonist Yuji Itadori would have learned nothing about jujutsu sorcery were it not for Gojo Sensei. In fact, he won’t even be alive.
Incidentally, Saitama is the protagonist for One Punch Man and he happens to be the strongest man in his Universe. Saitama also acts as a mentor figure to Genos. How will the two strongest men of their world, fare against each other in a fight?
No One Can Challenge Saitama
Saitama is uninterested in anything. Even the most powerful adversaries are no match for him, so he doesn't take his hero work seriously, breezes through everything with little to no effort, and pines for an opponent who will test him.
He argues that a lack of quality opponents has caused him to have a self-imposed existential crisis and that his ability to experience any and all emotions has deteriorated significantly.
His bouts are frequently anticlimactic because of his attitude, unstoppable power, and "unimpressive" appearance. Before obliterating his opponents with a single punch, Saitama will normally let them rant about their motivations and power up into their strongest forms.
Can Saitama Beat Gojo Though?
The whole idea behind “One Punch Man” is an undefeatable hero. If we were to ignore all laws of physics, then sure, Saitama’s punch would break through Gojo’s infinity and defeat him.
However, Gojo’s Infinity can not be infiltrated by its very nature. What happens when an unstoppable object hits an immovable body? Someday physicists might solve this paradox but who’d win between Gojo Satoru and Saitama is something that is destined to remain unanswered.
The only question that matters and will ever matter is, can either of them beat Goku?