Currently running 2 systems, both on a rPi-4 8GB. Jriver MC27 and since a week Volumio. I am only interested in bit-perfect audio. - I love the smooth interface of Volumio, versus the outdated GUI of JRiver. - The integration of Tidal and Qobuz with Volumio, which JRiver won't do. - I don't like the crappy library or better the missing manual adjustment/Maintenance in Volumio. Even though all albums that Volumio couldn't resolve have been re-tagged with MusicBrainz, still it won't recognize them. resulting in missing covers and artist. Even after multiple rescans, no improvement. Jrivers library functions exceeds. - Volumio won't provide any tools to optimize the audio to your personal preferences. Jriver has. - As Volumio runs on a rPi, sometimes the interface shows a prefix "common" on every label. This even shows in the Android app. Only a cache clear on the rPi solves this issue. Which is a bit annoying on a headless system. At this point I'am still using JRiver for 70% vs 30% on Volumio. Mainly because of the library and JRiver sounds a somewhat better (personal, I know)