- My friends use Spotify
- Larger library
- Well made playlists
- Social feed
In the end, they are very similar products. I feel that Spotify has a huge head start on Google here, and it shows. The more mature product is Spotify. I think Google can't really compete in terms of curation and popularity.
Really, the edge cases of "music that is not on Spotify" ends up being so small that Google's upload your own music feature doesn't tip it in their favor. At least in my eyes.