Board Thread:Monster Discussions/@comment-4851935-20140209154921/@comment-30161070-20170108022132

I think it depends on the incarnation of Ghidorah. Both Showa Mechagodzillas are roughly at the same power level, so which one is used wouldn't matter. Here's how I think it would go:

-Showa: Undicided, both are pretty close in power

-Hesei: MG wins. Hesei KG was taken down by Godzilla alone, unlike Showa KG. Plus, he seems to be almost useless when not under the control of the Futurians.

-Grand King Ghidorah: KG wins

-GMK: MG wins