I would have to say in my opinion Alexis Arguello was one of the greatest Boxer punchers of all time. Here is a quote from Cox's Corner.
"Alexis Arguello, “El Flaco Explosivo”, the explosive thin man, as he was called, was at 5’ 10” exceptionally tall for a fighter who weighed under 140 pounds. As his nickname indicates he was an explosive hitter, indeed he was perhaps the most economic and efficient puncher of the last 50 years. He fought in a boxer-puncher style similar to that of Joe Louis exhibiting near flawless boxing fundamentals with his chin down and hands held high. Alexis threw perfect left jabs and right crosses straight down the pipe and his left hook was a powerful force. He was a master at analyzing the flaws in an opponent’s style and then dissecting them with fierce body punching, accurate counters and precise combinations. Arguello would patiently stalk his opponents, take them apart and finish them off with an explosion of cascading bombs that came from a selection of powerful punches. Arguello scored 65 knockouts in 82 career wins that came with the suddenness of a man who was struck by a rattlesnake. "

He is number one on my list of all time great fighters and was a Champion both in and out of the ring. I am fortunate to have the gloves he wore in his fight with Ray "Boom Boom" Mancini.

Alexis Arguello was one of the best punchers that fought at his weight. Ray Mancini said that Arguello was the hardest puncher he ever fought. But I feel that there are better fighters than Alexis Arguello. Sugar Ray Robinson, IMO could knock Arguello out in 12. Even Muhammad Ali admits that Sugar Ray Robinson is the best fighter ever lived. Also I feel that Aaron Pryor could have beaten Arguello in his prime, same thing with Roberto Duran.