pipepipe and rimusic is what i use. youtube in the browser is fine too, if you disable that “open in the youtube app” popup (firefox for android with ublock origin addon is what i use, although i have experienced some regressions with the ad-blocker not working after youtube updates something, but ublock is usually on top of it and fixes stuff quickly).
also, the sponsorblock addon works on mobile and there is an addon that allows videos to play in the background if you need that. i haven’t tested this with youtube music in the browser but i wouldn’t be surprised if it also worked.