Google's contact has been utterly disappointing so far. They kept saying for months that they will port all missing features from Google Play Music to Youtube Music and they kept advertising that you can transfer everything over.

Guess what, they haven't transferred a single feature over and no, you cannot transfer everything over.

I'm still staying with YT Music because they have the second best recommendation engine —Google Play Music had the best by far. I did buy subscriptions to both Deezer and Spotify (and a 3rd party service to sync my collection over) to test, but their recommendations / radio features are way worse.