Godzilla breathes fire. King Kong is made of a highly flammable material...Godzilla has tiny little T-Rex arms. He has zero reach.
Maybe he gets lucky with a roundhouse tail kick, but the more likely scenario is Kong catches his tail and slams Godzilla over and over into a living death.
It's one of those UFC matches that everyone gets excited about but roughly 1 minute into the fight it's pretty apparent that it's a style mismatch in Kong's favor.
I'd stream it. Not buying the PPV.
King Kong is super athletic, with vastly superior speed, agility, and jumping prowess. He moves like a chimp, whereas Godzilla moves like a man in a rubber suit. He should wipe the floor with Big G easily.
That said, @jason73's point stands that Kong is a simp and therefore is automatically the loser. Plus, Godzilla can fly.