[joel_hifi]

Deviating from your current shortlist but since you mentioned you'd appreciate all opinions I'd like to suggest the Innuos ZENith Mk3, which is a streamer-server-ripper, excellent built, sound quality and user interface, and can act as Roon end point. I'm using one in my main system with great satisfaction, coming from the Auralic original Aries which is now running in my secondary system.

Regarding the 2 units you mention, from what I gather (but no direct experience with those specific models) the Lumin will sound a bit more leaner vs the Auralic. Actual owners of those models will correct me if I'm wrong and elaborate further on their sonic attributes.

So I totally agree with George, in the end it's a matter of system matching. Ideally you might want to borrow those units from your local dealers for testing in your home system. If you're buying used then pick the one that made top of your list after making your rounds on forums and if it doesn't match your system then at least the re-sell pain is lesser and you can move on to the another unit...

Good luck and keep us posted!