Here is a tier list of the tails in league of legends and what I think of their tails as a whole:
https://i.imgur.com/KlQyaLE.png
Some explanations on some positions as follows:
Aurelion Sol: The fact that it's mostly seethrough causes it to lose points to fall out of S tier
Cho'Gath: Would be S tier - but lacks smooth animations and loses points for that
Neeko: Looks tacked onto a human body - lack of flow causes it to lose points
Ahri: Similar to Neeko - and some weird modeling issues causing the tails to appear to extend from random places without a recent skin - has quantity over quality issues.
Nami and Cass: Never personally been a fan of leg replacement type tails
Shyvana and Nidalee: Both lose points for not having their tails all the time
If there is any other position you are confused about, let me know!
of course, a tail tier list like this will be subjective by nature - so I'd love to hear your personal opinion on the various tails of league and which ones you think are the best! Note that this is my first list for league, and as such some things can be moved around and re-positioned.
Thanks for reading my dumb list.