Do you think Ghidorah won in Invasion of the Astro Monster?

I would say it was a tie, because Ghidorah may have flown away, but in a retreting way, and godzilla and rodan were probly just really tired and didnt even want to go after him

I think Toho declared Ghidorah the winner. After all, the ending is the same as king kong vs. Godzilla. Although some greedy fans will say Godzilla won in both. To me, it was a tie in invasion of astro monster but, i won't deny what Toho decides.

^Pretty much this.

When did toho ever declare Ghidorah the winner?

Yeah, maby he did, maby he didnt. You could even look at this as the same consept as king kong vs godzilla, the vewer makes the choice.