The Incredible Hulk's power levels adjust to his stress, physical and emotional. However, just because 'the madder he gets, the stronger he gets' does not, logically, entail that he has unlimited strength. There is a feasible limit to the amount of psychic stress a human brain can generate, and even as a personality disordered mutant and a monster I can see no reason for Banner to have an unlimited capacity for rage - try for a second to imagine what that even means, it's just two words - unlimited and rage - which we can understand apart, but really make no sense together.
Even granting that it were possible for him to express 'unlimited rage' there is no reason to think he could possibly reach those levels before his mind or body failed to be able to process it - he would go insane and kill himself with his own power.
That might mean more if
1) We were tlalking about real life and not a comic book
2) There hadnt been plenty of talk of Hulk's limitless inhuman rage
As it is ists not really much of a muchness.
'Silver Age' aka classic Earth One Superman has, most of the time, literally unlimited strength - barring a special problem with using his strength or achieving a grip, he can move anything he can get his hands on at unlimited speeds.
Not really. Silver Age Superman's feats and exploits usually had zero to do with fighting or anything like that. It was an entirely different type of storytelling and the drama back then was often based on some ludicrous premise about Superman using Super-Ventriloquism to make Lois think that a pile of clothes was Clark Kent and thus preserve his secret identity etc. Even at his most super, Superman has tended to have hard limits to his physical strength, however high they might be.
This is far from consistent, but Earth One Superman was so powerful that no amount of comic book hyperbole could supplement Hulk's feats enough to make them even remotely comparable - Kal-El regularly does on-panel feats that make Reed Richards look like a college dropout and Marvel's top-tier in the Silver Age (never mind today's vastly depowered counterparts) unimpressive. The same, in fact, is true of Wonder Woman, even in the late post-Crisis/Pre-52 era.
No it really isnt.
DC just, as a stylistic choice, uses vastly higher strength levels. Marvel always has a much lower level - even ignoring the bogus Strength classes they give out in the HBotMU, etc. the greatest physical strength feats in Marvel tend to be on the Helicarrier-to-Continent level; even the guys 'in a class of their own' who make Hulk look weak - such as Starlin-written Thanos - are planet busters if that.
This is just repeating a well worn myth at this stage.
- The Annhiliators rearranged a solar system a few years ago
- Gladiator apparently tore apart black holes with his bare hands
- Hulk vaporized a planet by collliding with someone else.
In contrast Post-Crisis Superman never moved a planet solo unless he was powered up a la OWAW.
Post Crisis, the universes have been very comparable powerwise. Which is to be expected given that they basically have the same creators going back and forth from one company to the other every couple of years.
As a matter of top-level feats DC just feels freer to allow physics-baffling levels of mechanical strength in their Universe, whereas Marvel prefers to confine their brawls to something that won't result in one-punch-orbital-launches.
Marvel have plenty of them and not from necessarily from top tier strongmen either - Skaar launching Juggernaut across the solar system with one punch for example. Like anything of this type these moments arent really a great way to judge strength - they only happen when its stylistically convenient i.e. one or both of the opponents are flyers or its the end of the fight.
The idea that "DC is just more powerful" just cant be backed up anymore, if it ever could.