Easy to pick both because of the size/power difference but i don't think either of the two beat him handily if at all. Usyk isn't Chris Tyrd.
Im not really impressed by Usyk at HW. Beat by close decisions mediocre AJ and crack head fury (who was beaten more decisively by a fucking cage fighter the fight before). Im no fans of the klits, but i just dont see how usyk get ́past their size, power and speed. I guess its possible for him to hurt Wladerina enough to make him quit, but i dont like his odds. Against vitaly, hes simply outmatched. And is Usyk really that much better than Byrd? Again, im far from sure. Wins against Tua, Holyfield and VK (yeah i know) trumps for me AJ, crack head fury and dubious. Its true that Usyk was never beaten as decisevly as byrd was by WK and Ike, but he never faced guys as good as these two