I'd sadly, pick Hamed. Lopez may have hit a little harder, but he didn't have that same snap to his shots. He certainly wasn't as quick or accurate. I don't think Bobby's hit, get hit, reset strategy would work against Naz. Bobby probably messes Naz's face up some, and gets in some big shots which have him hurt. But the Prince lands his left (or right) which bombs Chacon out while Naz is down on the cards.
Give me Chacon. The Chacon who took apart Lopez and Marcano was a much better technician than given credit for, and I think he'd counter Hamed to death while surving some scares. Chacon was twice stopped by Olivares at 126, but Ruben just seemed to have his number in terms of skill. Hamed, though a bigger puncher than Olivares at 126, was at no point as good a technician. Chacon by UD.