Marvel's Godzilla laid the Hulk out with one stomp, and was said to be comparable to the mightiest monsters Thor had ever fought. That said, that was the 70's. Since then, we have even more versions of both, some of which get super abstract and beyond just strength, like the Singular Point Godzilla and the Immortal Hulk. That all said, if I just think of the Hulk and Godzilla walking around, it's a ridiculously buff green man who can throw around tanks VS a giant monster who can just stomp on them. The Hulk is one of the only characters around that size I could see going with the strategy of climbing up Godzilla to fight him, or grabbing him by the tail and spinning him for a throw, Mario 64 Bowser boss fight style, and it actually working. Both have a lot of the same power set (super-strength, super-durability, ridiculous healing factor), but Godzilla has the better inherent projectile option and is, well, much larger. Composites probably get ridiculous for both (Godzilla has been both a basketball player and an Eva Unit), and comic book scaling, of course, but my thinking is that Godzilla could beat the Hulk when just thinking of who both are generally.