I'd favor Casa at this point because the best versions of him is a tough, savvy, dirty winner with a style and attributes we haven't seen Loma deal with in the pros. No one ever beat up or dominated Casamayor anywhere near his prime and we don't how Loma would respond to a fight he's not dominating. Or the head butt left hand combo for that matter.
I was gonna say Loma, but I think I agree with Terp. Yes, I know Loma's improved since the Salido fight, but still... Salido's rough tactics threw him off. Only Salido is a dirty fighter with limited skill. Casamayor was a rough/dirty fighter with skill and talent.