it's more of a composite thing, where you have to consider all authors and editors equally and try to glean the range that each of them gives to any given character... i can see how in a specific Pak written storyline Hulk could beat one on one Superman, considering how he wrote each of them in his storylines, but there are enough feats and specific conditions in their whole continuity and pubblication history where the opposite would certainly be true as well.
i see them overall as herald peers with peak at teambuster levels, with equal chance overall of having one winning eventually over another.
The scenario where Pak sees Hulk winning after all is purely on a hulk centric battleground, where he is in a peak versions and in a "eventually the strongest one there is" mode, without mentioning versions for Superman at all and assuming that no matter how strong he is, hulk can become stronger by raging. But even then it's mostly if Supes act out of character. He said that he would actually see Superman/Clark as able to defuse the fight by durability and sheer personality, if you read the whole thing.
the main point there is that for Pak if they just punch each other and do nothing else, and Hulk gets angry enough and is prodded to the right degree, he can become stronger than Superman. But then again we have seen Superman become stronger as well, by taking off mental limiters, absorbing blue sun radiation, sundipping, with no specific limit set to his strenght in those occasions, being plot devices purposefully used, not unlike Hulk's rageouts. so i think it has to be taken into account, even against Hulk "strongest there is" shtick...