I like both Spotify and Youtube, but I can't decide which one is better, they both have advantages and disadvantages.
Youtube is so big and I'm concerned that they collect data which makes me not want to use them, even though I always use them as they are convenient. I like watching the music videos which has its advantages over Spotify. I suppose I could watch on Daily Motion but they don't have as many music videos, and are lot of them seem to be protected.
Spotify has its advantage in that there are only adverts every half hour plus its easier to find new music since that's what it's designed for. Plus, I've also found an app called AA Music that allows you to earn from listening to Spotify songs.