In my opinion, I believe that Godzilla would win this match. Gomora would not be much of a problem towards Godzilla or Jaws in water, so he would be taken down first. The fight between Jaws and Godzilla could vary in outcome, but I would find it leaning in Godzilla's favor. Jaws may have his teeth and mass as a weapon, but he would be defenseless if Godzilla were to attack him from the sides. Jaws' bite could do some damage, but what could Jaws do to defend himself if Godzilla began to claw out his innards? Godzilla has sunken way more boats than Jaws and has proven to overcome obstacles in water like the JD Navy and Ebirah. We may not have seen Godzilla underwater in a film, but we can infer that he would be an excellent swimmer. He did live mostly in the sea after all!