Lets go with guys in the one division he's rated in the top 10 of all time, welterweight.
Ray Robinson
Henry Armstrong
All-Time All-Division
Robinson
Armstrong
Duran
Ali
Louis
Pep
Hagler
Monzon
Greb
Langford
Thats just off the top of my head.
Dude, you should know better!
Hagler was great Mw and among the best P4P, but he's not better than SRL by a long shot.
I like both incarnations of Hagler. For clarification, they can be easily, though not perfectly, labeled as pre-champ and post-champ. The former was a more athletic, but still awkward/unrefined boxer-puncher; the latter was the classic type: pursuer, pick-him-apart, punisher.
The latter was better, but exchanged certain talents for others, and w/o those said talents he found himself somewhat imperfect. Not unlike post-exodus Ali, who gave up a degree ungodly speed for a sturdier chin and superior ring generalship, the latter version of Hagler gave up some speed and adopted a style that found slicksters problematic.... consider the success of Duran and Leonard, compared to that of Mugabi, Hearns etc. I also think that Hagler would've had a great deal of trouble w/ anyone who couldn't bully or who would push him back... after all he never talked about fighting Spinks or even Qawi.
This isn't uncommon, either; besides Ali and Hagler, Tunney - the most technical Hw champ ever - was a converted slugger after breakhing his hand. Few fighters even from the elite do as Duran did, and mature from one approach to another by perfectly synthesizing all their talents and skills.
SRL, unlike Hagler, didn't ahve any such flaws to speak of. List his imperfections and they're not really deficiencies, but that he didn't have an amplitutde of something. Namely, he didn't have tremendous power and he wasn't especially tall and rangey.
For skill, well-roundedness, and technical ability you have to rank him over guys like Hagler, Ali, Monzon, Louis, and Moore. For competition, accomplishment and footage, you have to rank him over guys like Wilde, Jofre, Benny Leonard, Whitaker, and Gans.
I'd even say he's better than or as good as Armstrong, but because Armstrong accomplished more Armstrong is greater, thus ranking higher.
I know this was drawn out and all over the place, forgive me. And forgive me if it came off as an attack, but it is not.