I used to use GPM and am now a Spotify customer. For starters, I was annoyed that Google removed some of its playlist interface around the activity-based radios

I used to use GPM and am now a Spotify customer. For starters, I was annoyed that Google removed some of its playlist interface around the activity-based radios. You'd click an activity and there would be several stations/playlists for different styles of music that were great for that general activity. Loved it. Now I can't find it anywhere. Second is the interface in general. Spotify realizes that especially on mobile, you have limited screen real estate. I really dislike Google's choice to overly emphasize giant thumbnails of album art I'll never care about or recognize, at the expense of not providing a list view for all levels of the hierarchy. This also leads to situations where artist names are truncated beyond recognition because there's only a few characters space for them. The GPM app on my Pixel XL also takes seemingly forever to load and play, podcasts often lose their place, etc. Spotify just works.