Back when I was more active here, I used to participate on a few pick my edits, this is the only one I know to have a released playable version as of now, unsure if it was completed though:
Dunno if it can be considered one of the best to play, but unfortunately I don’t know any other very well.
Since so many people suggest ideas for them, they end up very unbalaced, with stuff like extremely weak or strong units and with frustating challenges.
A part of the rom hacking community also isn’t a big fan of them, so there isn’t a lot of people who took their time to play through them.
Also, I found these two that are apparently complete, so might be worth checking them out: