Are you serious? Godzilla with ease.... Godzilla is larger than mountains and can sweep a plain field with just his tail, plus his durability is wickedly tough and no one in HST can even scratch him. Hell... He doesn't have to use his ray beam, he'll just stomp on top of team HST. Mountain Busting is a Joke in the GZ verse, hell even a low tier Kaiju like Baragon can mountain bust. Godzilla in final war was shown shooting a giant size monster Hedorah out of earths atmosphere, also Godzilla destroyed an asteroid that carried the momentum to destroy Earth. And no one in the HST is immune to radiation, so all Godzilla has to do is fire one beam and it's over.