Larry's jab stood out because it was the most famous punch in his arsenal. His punching power was moderate. His uppercut or right hand weren't anything to be afraid of. Liston was the more complete fighter, imo. He had a lot of powerful punches to go with his plowing jab. I vote Liston.
Depends on what you're looking for, really. Effectiveness and style or brute strength and raw power. Larry's jab was much harder to overcome than Liston's. But Liston's jab could score instant KOs. If he stunned you with the jab and followed up with his left hook then you're finished. But it's easier to escape Liston's jab than Larry's. Gotta vote Larry here kidos.
Good one. Larry's was more effective. It was money all day. Larry could jab you all day and it was difficult to overcome. Sonny's jab wasn't as accurate as Larry but if and when he hit you with it it was bed time. Or you could be instantly stunned.
Larry was king of the heavyweight jab, much like Joe Frazier was the king of the left hook.
But between he and Sonny, both jabs had their flaws.
Against Cooney, Cooney actually was almost outjabbing Larry for a few rounds. He was jabbing right in there with him. He started to time him and countered with his own jab and it was just as quick. Now, Cooney was a great prospect, but not a great fighter. If he could pull this off, what do you think a skilled technician with even faster hands and perfect accuracy like Joe Louis or Jack Johnson would do? Larry would find himself in trouble without his jab as his defense. Ken Norton also neutralized Larry's jab and this turned their fight into a shoot-out brawl. Larry couldn't jab so he had no choice but to fight.
As for Sonny, it was slow but strong. You could probably counter Sonny with your own jab twice before his even leaves his body. Easier said that done but possible if you have the hand speed and ring smarts to pull it off.