Spotify is annoying anyway, I've never used it before and I don't intend to ever use it. Ads don't really bother me that much, and even if they did, various adblockers exist. I'll continue using YT until the day it's no longer usable (or there's a better alternative), lol.
I suppose it does depend on each person and how they feel about it.
I had YouTube premium for a little while. I felt the difference from being able to click and skip around on any video without ever seeing any ads or interruptions.
Some will notice and others won't. I like having a music app for lengthy car rides and walks. I can shut my phone off and let it play. The ad free YouTube is a nice bonus.
Either way, I lost love for Spotify today. I don't see myself ever returning.