I would favour Valdez as the slightly more tested of the two at the elite level. He got mixed results vs the best technical boxers of the era, but on ballence did well enough for me to favour him over LaStarza at his best.
How is the defensively talented Lastarza going to be able to handle that 80" terrific Valdes jab? I think this is a difficult matchup for roland. He doesn't have the firepower to make valdes pay when he misses either.