I don't know if any of these guys can fight, as muscular people tend to tire quickly in combat sports and it's important to minimize wasted effort.
It looks like Thor has a size and range advantage so I'd say the weight is in his favour, but again there's no telling if any of these guys can fight or how they'll react, when they're stabbed in the nose or shot in the chest.
If I'm forced to bet, I take Thor Bjornsson because Eddie Hall isn't as strong as he used to be.
That's true they are good at lifting weight but I doubt how good they are in boxing, they tend to be slow and easily tire because of the movements they are going to make by punching, ducking, or by hugging, they are good at lifting and this is a totally different arena the fight could go either way but I'll go for Thor for having seen him with Fury and training together, I hope after this fight they will become friends and end their feud.