Sugar Ray Leonard is the h2h goat at 147, he comprehensively beats Robinson

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(filmed evidence to support the original claim)

 

Leonard with more movement had to cope with a lethargic fat Duran for 8 rounds to only win by a 1, 2 and 2 point differences in the scorecard (ignoring No Mas)

 

Ok Markus since you don't seem to include context in hindsight then we might just call this a day.

 

The best of Ray Robinson was a tad better in almost every aspect of boxing than Ray Leonard.
And he should be, he fought much more frequently, and was much more consistent. In a sport 80%- 90% about repetition .
But physically they were about the same. They could do anything in a boxing ring they wanted to do.
So for me it always will be , Robinson, Leonard, and Hearns in that order at welterweight head to head. Though of course many welterweights had more title defenses.