Today, I would go with Hopkins just because I think he is still very good at 175 while Jones is still good, although I can't see him beating the top guys in the Division anymore.
Jones would win a Decision 9-3 8-4, in a very boring fight.. Hopkins holds, wrestles and mauls more than he throws serious punches, and lets face it at 43 he's not getting any better, it's all downhill from here..