Why limit yourself to one streaming service?

As is mentioned above, Qobuz and Tidal generally cover too much of the same territory to make it imperative to have both.

When it came time, though, to track down a second streaming service for my all consuming, gotta-have-it-all classical needs, I ended up getting Idagio. 

For a time I subscribed to the classical streaming service Primephonic, but when Primephonic got subsumed by Amazon, I decided to switch to the scrappy German classical provider.  True, Idagio doesn't offer Hi Def, but their CD quality streams are more than good enough for me. Putting it another way, the Idagio dudes & dudettes have first class sets of ears.

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.

If Roon ever integrates with Deezer I might add that along with my Qobuz subscription.  I had it for years before going to Qobuz.  I think its great.

I use streaming primarily to screen recordings for purchase, so having two services wouldn't make much sense.  I switched from Qobuz to Apple because my wife wanted to stay with Apple and Apple is cheaper and "good enough" sonically.  I have also found that Apple  works much better in my car.  Qobuz kept dropping when I drove around to the point where I had stopped using it.  I use an LG Android Phone and as usual the phone company and streaming service pointed fingers at each other.

   I do have a second "boutique" streaming service called Pristine Classical, that specializes in historical recordings.  So adding Tidal or something to the two services would just not make much sense

I appreciate finding out why others approach this differently. I guess that varies a lot.

One thing I've learned about people "who have the money". They have money becuase they spend less than they need to. This includes multiple subscription services including streaming. Luckily, I just share family subscriptions with my brothers on Qobuz and Roon, so I'm basically paying for one subscription while having access to both.

FWIW, I do like the sound quality on Qobuz more than Tidal, but Tidal has all the kiddie music that Qobuz does not, which keeps my son and daughter happy. :)