This is a bit of a tough one to gauge. Obviously, the fight would be at 147 pounds and Benitez' career at that weight is somewhat limited although he was quite successful. Spence has spent his entire career at the weight and he's done well without truly being put into difficulty. Spence hasn't had to fight that an all-time great. I know what Benitez can do at that level so I'm going to go with Benitez.