My Hero Academia's finale just revealed why Deku is going to become the world's greatest hero, proving himself to be better than All Might.. Deku literally had enough power to bend the laws of physics and is curbstomping 100% quirkless shiggy who was directly stated to be stronger than prime all might.
All Might is likely to win a fight against Deku despite the fact that Midoriya is now stronger than ever in the Final War arc. That's because All Might was able to use the full power of the stockpiling ability of One For All even though he doesn't have Deku's access to the Quirks of the former holders of One For All.. One for All canonically got stronger when it passed onto Deku, even more so when he unlocked all the other quirks. How would his 100% be weaker than All Might's?