I have not listened to the Aurender units, but understand them to be high quality. My Mac MB100 was decent, but continually a source of issues. I gave up on it and purchased a new Lumin U2 (not a mini). The external power supply makes a significant difference in SQ. My DAC is an Aesthetix Romulus Ecplise with Telefunken NOS tubes which produces a nice analog sound (my preference). The quality of the DAC will make or break the SQ of any new streamer, IMO. A high-quality USB connection made a noticeable difference in SQ over single ended and digital coax.
Other observations- yes @lordmelton - the plate above interconnects is a PITA. The Lumin remote app takes some practice, although I don't know how it compares to the Aurender interface. Lumin has timely firmware updates, which install seamlessly. I connect with both Tidal & Quboz, SQ between the two on my Lumin is comparable.
Good luck