I hear a difference between Spotify high-quality (320 kbps) and Qobuz. Small, but noticeable -- and worth it to me.

The biggest difference is in detail and separation. I hear the placement of the instruments with better clarity with Qobuz high-res files and the sound doesn't disintegrate into mush as often in complex passages.

Again, this is not a "part the Red Sea" difference. But I notice. And I prefer Qobuz.

Tidal uses MQA, which is pure snake oil and marketing rubbish. Qobuz files come straight from the masters, with MQA only if the record company offers no other high-res streaming file. Maybe that makes a difference -- who knows?

I'm sure some will disagree. Fine -- you don't have my ears or brain. I hear the difference, so I don't care what you think.