I'd pick Taylor easily. Barkley was as tough as Pavlik but nowhere near as good and Taylor did box pretty well against him in their rematch. Jermain by commanding decision
If Hearns couldn't beat the guy, I don't see Jermain Taylor beating Barkley. Barkley was an animal, and would have simply overpowered Taylor midway to late in the fight.
I could see either whiskeys scenario or Xs ... Hegmans argument would make sense if fighters vastly inferior to hearns hadn't already beaten Barkley ... They did