From the list gotta go with Whitaker. From ones over last few decades..

Whitaker
Winky Wright..belongs in any era.
Manny
Camacho
Mark Johnson
Nunn
Calzaghe
Byrd
Hamed
Zaragoza

Top notch going today Crawford largely switch hitter, Spence Jr. Andrade, Usyk, Regis Prograis