Hulk or Godzilla or Superman or Thor vs. cosmic entity (like Galactus)
Galactus is a force of the universe. It is always strange to me how some would even think to put heroes like the Hulk or Superman on that level. It just doesn't make sense that being from another planet or being hit with gamma radiation makes a being so incredibly all powerful. At least a hero like Silver Surfer was granted powers by an entity like Galactus so it makes sense for his powers to be on a cosmic scale. I know a lot more about Silver Surfer than Superman, but it seems like his powers have gotten all out of proportion from the original intent of Superman (the original couldn't even fly!) Silver Surfer was conceived of as a cosmic power. Hal Jordan Green Lantern seems the same. Godzilla came from Earth, so it also doesn't make sense to put it on that all powerful level. I am not arguing that Silver Surfer is more powerful at this point in the storylines, but just that his power makes more sense in the comics' world.
Personally I think that some of the purity of the comics is diminished when so many beings compete for the all-powerful, godlike mantle. Originally, the only way to defeat Galactus was to threaten him with the Ultimate Nullifier, plain and simple. And even then Galactus just sort of went away with disinterest. It was really cool when beings like The Watcher and Galactus were more rare and had more mystique to them.
So regarding the battle in this thread, cosmic entity wins with next to no care.