I would bet my money on Legendary King Ghidorah. IDK why do many YouTubers show Keizer Ghidorah as the winner. Means King Ghidorah is like 20 mtrs taller and 40,000 tons heavier but YouTubers state that Keizer means Emperor and Emperor is powerful than King so Keizer Ghidorah would win. Means it doesn't makes any sense. U compare that King Ghidorah fought the 2nd strongest Godzilla 4 times! In the 4th fight it died.
In 1962, two giant monsters (a giant ape and a giant reptile) fought each other in the ruins of Tokyo. Brought together by man's greed and their own primal instincts, their battle caused massive destruction and mass human slaughter. During the fight, they left pieces of themselves behind.