I think to beat Walker (a prime Walker) you had to hurt him, barring a big size advanTage. I could be underestimating Giardello but he was maddeningly inconsistent. Walker close UD.
Id have to go with Walker. He would make Giardello work all 15 rounds and Giardello didnt like to work.
PP, if a neighbor of mine Harold Green could flatten Joey Giardello in 1950 with one left hook, no way does the inconsistent Giardello beat one of the toughest and greatest MWs of all-time Mickey Walker, the Toy Bulldog. Mickey outclasses Giardello in 15 rounds...
when joey g was at his best and on top of his game i believe he would out hustle and outbox walker i also believe that as giardello got older he developed some extroidanary hitting power could be a toss up but im going with my man joey g.