Honestly, either would be good, for different reasons. Floyd would be great, because he's the best, and only 10lbs lighter. Junior would be good because he's been coddled his entire career and fights (Miraculously) as a MW, but comes into the ring at 180. Daddy Chavez buys quality scales for Jr.
Both great fights, but I pick vs JCC Jr. Since he has a better chance of winning that fight. Maravilla is my boy.