Lately, there have been suggestions and opinions on who'll win in an all out battle between all might and might guy.
We all know that these two characters possesses extreme physical prowess, and that will be the deciding factor in this battle.
But to measure their physical abilities, let us take into consideration their achievements.
All might; all might is a symbol of peace. He was able to give a punch so strong that it changed the weather around him, also his punch is so strong that just the shock wave can destroy half a city. He was able to give 300 punches in 30 seconds, he is faster than grand Torino (that moves at mach 3), he redirected missiles with a casual chop, he overpowered a shock adsorbtion quirk with punches and can move above mach 40.
Might guy; might guy is a ninja who specializes in taijutsu, he possesses extreme physical abilities. When moving together with Lee, he moved so fast that puppets that were linked to his movement couldn't keep up. His hobby is simply to do side steps, might guy has a special move where he oppens the 8th gate and allows chakra into him, this move greatly increases his speed and power so much to be acknowledged by Madara. Madara stated that he had reached the peak in physical abilities till the extent that no other person can compare.
With this the winner is All might. My reason is that; with his speed he can easily break the sound barrier, this speed has far surpassed that of might guy, and the strength of all might is that which will go 100% +ultra.