I've always enjoyed watching the little guys go at it. So my pick is arguably the best bantomweight of all time - Carlos Zarate
I cannot discuss boxing without involving my father, so he gets a pick here too. He always liked Hands of Stone - Roberto Duran. Sorry Dad, I've never liked him since he beat Buchanon on a low blow. My Dad would counter that Duran was winning on points. I'd counter that Buchanon was a Scot. My Dad would just give me that look.
...never let a little thing like a fact get in the way of a good theory!