Both great at their respective weights....Jones takes this easily but it's irrelevent in the grand scheme of things, like asking if Hagler would beat Pac.
size really is the only factor in this discussion, 147 was Leonard's best weight and i would be confident in picking him against damn near anybody in history or the future, but we're talking about RJJ, at 168-175, i would also be confident in putting him in there with anybody in history, RJJ was probably the most talented fighter to ever compete at those weights, speed and power combined with cat-like reflexes, whoaaaaaaaaaaaaa, he was an animal :deal