Anyway, you post got me curious and I subscribed 1 free month trial with Qobuz. As a first impression, obviously that from a ecosystem perspective Apple is better but that is also not a fair comparison in my case.
From a sound perspective just a few rapid quick comparisons. The sound is different, for sure. Still very early to tell but Qobuz seems cleaner, clearer. Apple seems more bassy? more colored? Overall there is a difference for sure, even to my untrained ears but can't still grasp what it is. I admit that right off the bat, I seem to prefer the Qobuz sound.
Nevertheless, there is immediately a big, big library difference that would render irrelevant any of the above in a choice perspective. For my predilection music genre (Instrumental Progressive Metal) Qobuz is light years behind Apple Music. In a quick search for my favorite bands, with many not being very popular under the genre, I was mesmerized by the superior offer of Apple Music.