Youtube Premium or whatever they call it now. In general, paying to not have ads is great. If you spend even a moderate amount of time on YouTube, this will quickly pay for itself.
I got tired of Spotify raising their fees without much quality improvement. YouTube had a really good algorithm for music discovery, to the point I was discovering music on YouTube and copying it over to Spotify, which often didn't have the same covers I liked. At some point, it made more sense to switch over. Being ad free was just a side feature.
Also there's some preview stuff that only Premium subscribers get. It's not worth getting for itself, but it's a nice touch.