I have a similar DAC (EMM Lab DV2). I hope I can give some good feedback based on my experience
-Short answer:
I would say go for Aurender (reasons below)
-Long answer:
I originally bought the Lumin U1 + External Power supply unit + Network NAS Drive + Remote.
--For sound: sound was great when I was streaming locally through a USB drive. When connected through Roon, there is a slight drop in detail in the sound presentation - it appears this is known from others with a Lumin and using Roon (topic can be found on the internet via other forums). I was not able to get my computer to cooperate in order to load music onto the NAS server... my computer would either not see the drive, crash, or never load music. I tried to talk to Lumin customer support to get it to work, but the support guy just said I was doing things wrong.
--For app: The app is Linux-based if I remember correct. Esoteric's music servers utilize the same exact software. I was not a fan of the software at all - it looks very dated and the general usability isn't great at all e.g. sorting your music is limited, navigating through it doesn't seem to work well. I found Roon to be infinitely better in this regard, but when comparing music heard via the U1 by Roon or the Lumin App, the Lumin App had a noticeable better level of clarity.
--General usage: The remote is a nice touch and makes things easy to use from distance. I did not like how the back of the unit has extra several inches of metal covering the input ports - it made plugging/unplugging a hassle. The display is basic. I was not a fan of the network NAS method they use, which is an external harddrive of their own whose hard ware cannot be swapped out and can only be connected via ethernet to a network switch -- Lumin claims this allows for the best sound quality.
I spoke with an Aurender Rep about the N10 and was recommended the N20 as a better system match to my DAC. I am happy with the expense and the product. In comparison to the Lumin:
-The Lumin is quicker to boot on if starting from off. The Aurender I leave on (it will go into standby mode if it doesn't play music for 3 minutes)
-No option for a remote on the Aurender, but it does have some physical buttons on the front of the unit to do basic playback control.
-I didn't think the color screen would matter, but it is a nice touch to the presentation. If there is a worry about possible interference of the display, there is an option in the software to turn it off completely.
-The sound presentation seems to be more open in comparison to the Lumin. One nice feature that Aurender does in which Lumin does not is that the Aurender will cache music to be played.
-There are two bays in the back of the unit to install hard drives of your choice (Aurender recommends Samsung QVO). Copying music was easy - you can browse via a computer and copy to it as if a server, or you can connect to the unit via a USB drive or hard drive and copy through the app.
-Back of the unit doesn't have a bunch of metal over the top, so connecting is easier
-The Aurender Conductor App is a lot more functional to use than Lumin. Roon is still the best software of the three, but the Aurender app is still good e.g. easy to sort music, user interface is more modern looking, search indexing is more consistent, easy to create multiple playlists.
-You can airplay with Roon on the Aurender, though I think Aurender's software is generally good enough to use on its own.
Hope that helps!