Very cool mixup.. I have yt premium, and I boycotted Spotify a long time ago. However, Spotify is probably still the best service for playlists.
Although youtube music is in the plan, I don't use it, because the UI is not that great and there's this weird entanglement with youtube videos.
I generally use (video) youtube and soundcloud for music. They're the easiest way to find the stuff I like to listen to.