I've used most available services, but discontinued one after another along with promises that a better user experience will be provided with reduced content and removed functionality with the slight price hike.
YouTube was my first and last video service I paid for, only Spotify remains on the borderline.
You don't want YouTube + YouTube music but you want Spotify + YouTube? I abandoned Spotify the second YouTube Premium was introduced in my country. I loved Spotify. I started using it back when it was invite only. YouTube Music is worse for sure, but it's good enough and a lot cheaper.
An easy answer, Spotify are where my friends hang around. I would not have any second thoughts to drop Spotify, but for me I love to share playlists, tracks etc with family and friends.
As general nobody use YouTube music here in Sweden.
I know. I'm also from Sweden. Everyone uses Spotify. We were such early adopters on a very broad scale it very quickly became a standard. I don't know anyone who uses YouTube Music except myself. Yes you can't share songs or playlists but I realised when I couldn't do it that I didn't really miss doing it either. I can still send my friends a text about new songs I like. I dunno. To each their own I guess.
Android has Revanced for YT Music, which is what I use. Only thing I miss out on from premium is the automatic local caching of tracks (called downloading officially). But I just use a different app to download music from youtube playlists as mp3 files if I really need them offline.
I stopped paying for YouTube the moment Google killed Google Play Music and forced YouTube Music on me. Now Google gets no money from me and Apple does because they still offer a true music library service.