I use Amazon HD via a Node 2i with a wired network connection. I recently got an outboard DAC which I think improved the quality. I've tried Qobuz several times when they had deals. The sound quality on both is excellent especially with well mastered hi-res recordings.
Now, I don't obsess over the sound quality because most of the time I use streaming is for background music and when I'm checking out new stuff. Most of my real listening is done on vinyl.
But, Qobuz drops out several times a day when I used it, only for a couple of seconds, but it's really annoying. In the 3+ years I've been using Amazon Unlimited, I've maybe had 2 dropouts in that entire time. That, and the lower cost of Amazon for me (we have Prime), and there hasn't been a real reason to switch.
I'll probably try Qobuz again, they have a month free deal going on now. Maybe they've improved the service since last time I tried it.