Both of these guys really prefer to settle their fights in fisticuffs. That said, there is a huge difference in power between these two. All Might in his prime could blow away buildings with his punches and could probably level a city. Rappa’s hits deal a lot of damage but on a far smaller scale. It’s also hard to see them doing enough meaningful damage to stop All Might before he loses consciousness. Rappa’s definitely a great character but he isn’t quite strong enough to win here. All Might wins.