@Frank_Berens1 – you are comparing apples and oranges. Roon vs ROCK doesn’t make any sense. It’s like comparing Safari Web Browser to Microsoft Windows.
I wrote a very high-level guide to the concepts between all these pieces here
https://community.roonlabs.com/t/what-are-the-differences-roon-endpoint-os-options-roon-server-vs-rock/26448/7?u=danny