Audiobookshelf works great and is very easy to setup using Docker. I get most of my audiobooks through Downpour. They have a subscription that gives credits to redeem for audiobooks similar to Audible, but they are drm-free. I download the audiobooks and move them to my NAS that has Audiobookshelf running on it. Audiobookshelf has a web client and apps for Android and iOS (TestFlight beta).
Apple Music because it doesn’t shove podcasts down my throat. I also prefer the algorithm on Apple Music over Spotify. Spotify is too safe by only recommending music that I already like, while I have discovered new genres that I now love from using Apple Music. Spotify is just too repetitive in my experience. I do miss the Discover Weekly playlist though. That was the one thing that helped me discover new music on Spotify.