Best Music Library with subsonic API?

Hello!

currently i use Jellyfin for my music library but i am not really happy with it. I used to use Plex and it was wonderful but... here we are...

I already tried Navidrome but for me a crucial feature is to be able to import spotify playlists and rebuild them with my local library.

For jellyfin there is a plugin that does that and it works 90% of the time. But even after finding several scripts and docker-composes i could host i was never able to properly import my spotify playlists into navidrom. Reason why that is so crucial is that i use spotify to build playlists, make song-radios and add them back into the playlist and then i download this playlist using various tools.

I then rebuild these playlists inside my music library.

Now i found Music Assistant 2.0 for my HomeAssistant and it's incredibly awesome! Being able to fully use my sonos speakers and group them on the fly is amazing! But using song radios inside it with my jellyfin as the media provider apparently uses jellyfin's "instant mix" and my goodness is that ever hot garbabe... i have my whole library being properly tagged by Picard and every song has the proper metadata and all that but Instant mix is just plain useless. For 50% of my songs it will just put the same song 5 times into the queue and be done with it. Sometimes it's actually able to build a good sounding radio but that's really hit or miss.

So to conclude, what would you guys recommend if i want a music library that:

1. Has preferably a subsonic API to maximise compatibility with different players
2. Has the ability to import and reconstruct my spotify playlists
3. Has a working song radio / instant mix feature that will not collapse as soon as you try to use it

Thank you very much!