Hard fight to figure. I have to go with the guy who proved more in his career. Roy. Roy by SD like someone else said.
Nunn . Just as much as left handed as Tarver , at least as tall and quicker than Tarver . Nunn would have outpointed James Toney if he wasn't as drained as he was against him . Nunn outgrew 160 but didn't move up in weight in time . If he had , it was possible that he'd have remained unstopped 2 this day .
The Nunn that fought Frank Tate would be very tough for Roy Jones to deal with, but I suspect Jones would find a way to win. He could edge Nunn by a point or 2.