I would go with Wlad But, (this is where I get it from all the wlad-getarians) I believe Wlad has faced a group of carefully chosen opponents....
I agree Arguello was moving up, but Pryor was so wired by that point of his career he was pretty unstoppable. Kameda and D. Johnson each floored...
Vitali has been on the shelf so long, Danny Williams would look good against him