Roon/Tidal. My only regret is that I didn’t start using Roon earlier. As to Tidal vs. Quobuz, no particular reason other than I tried Tidal first & liked it enough that I didn’t bother to check out Quobuz (summary of online economy)
Spotify, however, seems much more social - easy to share & swap playlists, etc. - if they get to CD quality streaming, I might add a subscription
Experimenting with some downloaded hi-res off of HD-tracks - just a couple albums to see if I can hear a difference etc (e.g., Billy Holiday’s Lady in Satin, hi-res download vs Tidal FLAC). Don’t know if I have the right ears or gear. But experimenting part of the fun
Welcome feedback on the hi-res download sites - there seem to be about four or five serious ones. I do appreciate that people doing more & more reviews of hi-res downloads in their own right, esp. in comparison to physical editions, etc.