I think the concept of a best essay is somewhat illogical, but exploring the idea like this makes an interesting post. After all, the term "essay" was invented/popularized by Montaigne in a book of his writing called "Essays" - and "essay" is French for "to try." So from that context, essays shouldn't be concerned with finding answers or be the "best" but to make discoveries in the process of trying.
> is French for "to try." Which looks to be where the English word assay comes from too: https://www.etymonline.com/word/assay
To "assay" is to engage in an "investigative (analytic) procedure" upon some thing [0].
To "essay" (je vais essayer) is an attempt to achieve a specific thing.
The former seems more like an exploration without initial expectations, like a fact finding, focus group, or initial prototype.