I was a youtube/google play music subscriber for years who recently switched to spotify and I think the same about the opposite! When I moved to spotify I thought the recommendations were better. Now reading your experience I think that maybe they aren't better, just different.

Youtube music is really a shame. It was a big step back from google play music. Sorting liked albums & songs is difficult. If you like a video on youtube that happens to be music, it will always show up in your liked songs in youtube music. Having such crappy streaming options just makes me want to go back to pirating.