This is probably how I would lay it out if pushed, but, really, it's near impossible to say. Of course Robinson is a favourite over all of them...
I take Robinson at his absolute best over pretty much anyone from 147-160. The finest Robinson at 160 i take over all of em, but admit he never had the consistency there of a Monzon or Hopkins.
It's hard to gauge Robinson against those guys at 160lbs. A case could be made either way IMO. Afterall, Robinson was very beatable at middleweight. If someone like Turpin could give Robinson hell over both fights then a case can be made for any of the three in question to do the same. Robinson was at his best at middleweight when he had something to prove.
Yes, we know all that for sure. Robinson was not a natural middle where the other 3 were. Given his age and natural weight he was never going to be as consistent. When push comes to shove however i like the best of Robbo vs all.
Orthodox technical skills/fundementals 1. Hopkins 2. Hagler 3. Monzon Pretty close between Hagler and Monzon.