Hard to pick. Watching Roy jones against Tarver and Johnson I pick Ali. But watching the Alonzo Johnson, Zora Folley, Jimmy Young fights, I pick Roy Jones. If neither had ever lookedbad it would be impossible to beat. All fighters look unbeatable for one night. And All fighters look very beatable for one or two nights. They each have a best performance and a worst performance, so it's impossible to pick unless they fought and exposed each other's weaknesses.