The creators said that the hulks starting strength was listed at being able to lift a mountain. If you are that strong at the start, I'm pretty sure hulk you can punch with about 8 times the force then he can lift. If the hulk can lift a 1 trillion ton mountain by himself, which he has done then a punch created is 8 trillion pounds of force. Broly cannot create that kind of force.
Broly has a limit, he does not have a heal factor. Hulk's power is potentially limitless, Hulk has a heal factor.