Hi OP,
just my two cents. Tidal has more albums and individual tracks than Qobuz. But, Qobuz almost always sounds better when you compare them side by side. I was a long time Tidal subscriber and also subscribed to Qobuz when it came to Canada 🇨🇦 this year.
i thought I could get rid of Tidal but it has too many unique recordings that I value.
So I set Roon to prefer Qobuz and that works well.
However when Tidal Hi Res tracks start to show up on Roon, Tidal might sound amazing.