Right now,I'd favour Guzman due to experience. But remember,Valero has barely fought,most of his fgihts have ended really early and he ALREADY has a title. He looks amazing in sparring,nothing like he does in fights,he boxes,lovely technique etc,I just wished he showed that in the fight. If he did,he would beat nearly everyone at the weight imo. Soto also seems to be getting better and better too so it's close but they are 3 stars in their own right.