Excellent checkmates vs. best move checkmates

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KaeJaeWaves
In Analysis, when there is a choice between multiple checkmates, some checkmates are considered excellent, while only one is considered the best move. Since the difference between them presents a different accuracy rate, chess players should be able to have insight in what makes a checkmate the best move. But so far, i haven't been able to find any information about this subject. (I Did find a pattern; in queen&king vs. king endgames, Analysis favored mate with king and queen connected over backrank/opposition mate.) Does anyone know the specifics?
Sred

As far as I have seen, all checkmates that require the same number of moves are considered equally good. If there are multiple possibilities, they should all show up as best. Do you have an example where this is not the case?

RavenDeLaVinci

This just happened to me. Both are M1, but Qf3 is "excellent," whereas Qh4 is "best."