batman has enough time to make counter weapons, JLA will stomp. if its just strategy, most likely godzilla
No weapon made has ever worked against Godzilla in terms of fully killing him, the closest thing to that was the Oxygen Destroyer and all the plans/knowledge of that weapon was lost when the creator of it was killed, and even that does more harm then good as even the creator of it was dying from the effects. Well and also MechaGodzilla 2, but that was made from remains of technology that was from the future. Anyway just throwing that out there, am not wanting to get sucked into this debate.
godzilla is nuclear, there was an anti-nuclear weapon i think called the Anti-Nuclear Energy Bacteria (ANEB) used against him i think only once, and it knocked him out for 3 years. 3 years more than enough to come out with another plan to kill a sleeping beast
what type of weapons does the UNSC have, if its just normal bullets, it would do little damage to the terminators' titanium armor. the it will take a few hundred rounds to put one terminator down, and by then, the terminators will have already reach h2h combat distance