Hi Jerry,
I guess it depends on what genres and how obscure your music choices are. I find lots of things on Deezer, for example, that aren't on Qubuz.
Why limit yourself to one streaming service?
I’m always puzzled when I read posts from people with 10K+ systems who feel they have to choose between Tidal or Qubuz or whatever. Sign up for however many brings you more joy. That’s my two cents.