I wrestled around with a 145-lb female black belt in karate who also had high level wrestling and a fair amount of Jiu-Jitsu. I would say it was a draw to be honest. Knowing nothing about wrestling, I was not able to pin her, nor was she able to pin me, knowing basically everything about both wrestling and, especially, karate. So that sort of answered the question to me as to who would win in a fight - a national/world level 145-lb female karate black belt vs. a national level 170-lb strongman.
I think bodybuilders know that 99% of people won't fight them if they carry a lot of size, hence the draw to bodybuilding. But if you want to beat other people up, you need to take up fighting. I do feel that I can hold my own, generally speaking. But only against people who don't know how to fight.
