I use the Sonore microRendu with my Small Green Computer (SGC) Roon core/server, and am quite happy, but have considered moving up to the OpticalRendu. The SE is above my budget but has gotten excellent reviews.
You obviously have a handle on networking and optical—much more than I. The Sonore isn’t an all-in-one server/streamer like the Innuos, though — just a streamer. Oh, I was told by the SGC guy that the Sonore power supply is better than the SGC one (which I use), though 3 or 4 times more expensive...FWIW.
Steve Plaskin with Twitering Machines reviewed the Signature Rendu SE/optical- May 6, 2019
Steve said, "Sonore has managed to take the original Signature Rendu SE to a higher performance level with the new Signature Rendu SE – optical Ethernet to USB output. The folks at Sonore have made it simple to assemble the optical setup with their systemOptique certified list of approved gear that will eliminate a good deal of component trial and error. Sonore has combined their new opticalRendu and upgraded Signature Linear Power Supply to create a superb component that improves upon their previous work and delivers the finest streaming USB source I have yet experienced."
SGC
Innuos is doing some interesting things now it seems, and I was interested in their units for a time, but several years ago I’d read that their mid-level servers didn’t run Roon well because they lacked gigabytes for the OS, and that their native SENSE app (as an alternative to Roon) wasn’t fully evolved. Is it now? They have expanded their product line and I have NO idea what I would be interested in now. I don’t see Roon mentioned much on their website in a quick look just now ... do they still offer a Roon-ready or approved servers? Innuos
This comment is probably not very useful to you! But I couldn’t resist, and now I have to walk the dog. 😎