My family has been sharing Google Play Music and absolutely love it. My favorite feature, and the one that differentiates it from the others, is that you can also upload up to 50,000 songs and then stream them anywhere. I listen to a lot of random/live/bootleg stuff that isn't available through any service, but I've uploaded them to Google Play Music and can stream them anywhere. I also really like their radio feature that you can play based on artist/song/album/mood/activity. Works great when having people over or a party.
All that said, I'm getting pretty annoyed with Google changing their plans over and over. As of now Google Play Music still works perfect but they are supposed to be migrating to YouTube Music. However, not all of the features (i.e. the uploaded songs) have been migrated yet. That said, I believe right now, if you subscribe to one, you get everything (for example, we pay for Google Play Music and get YouTube Red (shows and no ads) and YouTube Music included.
/rant
All that said, I'm getting pretty annoyed with Google changing their plans over and over. As of now Google Play Music still works perfect but they are supposed to be migrating to YouTube Music. However, not all of the features (i.e. the uploaded songs) have been migrated yet. That said, I believe right now, if you subscribe to one, you get everything (for example, we pay for Google Play Music and get YouTube Red (shows and no ads) and YouTube Music included.
/rant