I'm currently in the market for a music server myself.
I want it all, I want something that will fire music at my Google home links, and also some raspberry pis with speakers, and also serve to my phone in the house and away from it.
I have Logitech Media Server running ATM and for a long time, but it is, and always has been a bit hot and miss.
I have a music file system in OMV which I can access on my LAN. This is the source of music for LMS. But I also have Plex pointed at it
This allows me to play the same music from any TV or phone with Plex on it. Plex even have an app called Plex Amp. I use Symfonic though, I liked it enough to buy it.
These apps give me the option to cast my audio to the Google Homes minis I have, I need something for my Pis.
Another advantage I recently found of adding my music library to Plex is I downloaded a program called MediaMonkey to stick music on my old iPod that I have in the car. It picked my Plex library up straight away, although to its credit, it also found my original music Share, it just didn't advertise the fact.
I use Plex myself but there's Emby and Jellyfin to look into too.