While PBF wining by a lopsided decision is pretty likely, I don't see him (he has never shown really destructive power at any weight) moving all the way up to 154 and stopping a guy that's only been ko-d once (by a legendary middleweight with a bodyshot...not by Mosely, Trinidad, Vargas, or anybody else at welter-middle with real power) in the 6th round.
I want Oscar to win but I'm not particularly confidant, though.