currently i'm using the new MSB 'Roon capable' Ethernet Renderer on the MSB Select II, and then using the SGM server as the Roon host. i'm able to A/B that to the SGM with USB.
they are too close to call so far, with a very, very slight nod to the new Renderer.
there is a new 'Evo Spec' upgrade coming for the SGM server. when that happens i will see whether that upsets the stand off.
i've also run some optical cable in my conduit from my NAS to my audio room where the MSB and SGM are, so we will see how that might change things, as well as trying other Gigaswitches and linear power supplies.
at the top of the food chain, it's not yet clear where this is going.