I switched from Apple Music to Spotify for around 12 months, starting before but mostly overlapping with the pandemic lockdowns. I found their playlists, auto-play features, and discovery better than Apple Music's. Spotify links are ubiquitous on social media and elsewhere, which is nice (although Apple isn't far off either). And their Spotify Connect ecosystem is pretty nice: I loved how I could click the speaker button in the Spotify app on my iPhone and stream my music to the "Everything" group that plays simultaneously on all 3 Amazon Alexa speakers I have in my apartment. Apple Music's integration with Alexa speakers is nearly non-existent.

But I ended up switching back to Apple Music because of something that seems so minor but is so fundamental: Spotify on iPhone simply does not let you browse your entire library by artist. You can search your library and find anything you want, of course, but there is simply no way to serendipitously browse all the artists in your library. You can "follow" artists and browse all those artists, but that's a separate system from your music library, and when you click on an artist you just get the standard Spotify artist page (rather than a list of that artist's albums that you have in your library). For me this ended up being a dealbreaker and meant that during my Spotify trial I listened to much less music than usual because I simply couldn't browse my library effectively.