if any one really wants to know, the most powerful character of the marvel universe is the one above all{not to be confused with a celestial of the same name}, he is the GOD of the marvel universe.
as far as dc is concerned, there are a three, the first one is probably parallex, with all the rings of the former lantern corp{he could desrtoy multiverses}, then there is spectar, who can have ne power he wants at any level he wants, and then there is GOD{never seen but only heard of}, he gives the spectar his power, but this being is only said to be god, no one can however verify that fact.
Hulk in his dumb form can be strong as just about anyone, it not questionable that he should be neat the top of the list. Thor should be much higher, as he is actually slightly stronger than the hulk at his best. And superman might be a little too low on the list as well. As for lobo, he is pretty much neck to neck with demon.
actually, thor isnt really newhere close to the potential strength of the hulk, remever the onslaught happenin, all the heroes of the world includin thor could not even dent the armour of onslaught but once jean took away the rational mind on bruce banner through telepathy, the hulk became so enraged that he RIPPED apart onslaught's armour, so whose the stronger thor or hulk? n dont forget that when i say all the heroes of the earth combined, i also mean some pretty powerful villians like juggernaut.