Cretacious King Ghidorah wasn't that strong but was able to regenerate from a tail. This is a close call but I probably would side with the MGs. MG'93 can fry CKG to a crisp if all his weapons were deployed and not overheat. For Kiryu too has the advantage with his weapon arsenal and also his quick fighting ability.
<G-FoReVeR>GFOREVER Ver 4.0