Arguello.

Salvador has a great resume but his openings were never truly taken advantage of by someone the class of Arguello, Sanchez beat some great fighters but styles make fights and Arguello;s style may be the one that would give Sanchez problems.

I think Arguello would figure out Sanchez's style aftert he first 5 rounds, and then turn it up and sweep the next rounds before stopping Sanchez in the 14th.