Jones until he started slowing down, when he got just a little slower and he started having trouble with his hands around 1999-2000 he became less of a KO puncher. He also became more cautious and threw less punches, spent more time on the ropes that also made him less dangerous. In his prime he KO'd Tate in 2 with a single punch, Tate went 12 with julian Jackson. Merqui Sosa supposedly had the best chin in boxing, roy stopped him in 2. Montell griffin and Virgil hill gone with one shot. Stopped glen Wolfe for the first time, one shot in the first round. Malinga went the distance with benn twice and roy knocked him out with one punch. Hearns was a very hard puncher at 160 and above but his best weight was 147-54
Hearns was a devastating puncher at ww / jmw. However as the opponents got naturally bigger the ko's % lessened. Jones Jr was lighting fast and a lot of his ko's came because his opponent never saw the punch. RJ was like Pacquiao in that the ko's dried up once he went up in weight. Based on natural weight i would say Jones Jr.
