I've ditched Spotify a few times, purely for financial reasons since I'm already paying for YouTube Music, I always get frustrated and re-subscribe.
With Spotify I can switch between my car, my phone, my desktop, my loungeroom, my shed, anywhere I'm signed into Spotify, without having to start the song or playlist again. I've read YouTube Music working on this and it might be enough to get me to switch.
I don't care who else uses Spotify.
YouTube Music doesn't have a dedicated Android TV app, there's no background playback on either of my media players and I don't care for video clips.
You can also see all upcoming songs, and rearrange/remove them if desired, with Spotify. Maybe I'm not understanding your 3rd paragraph.