Lumin vs Auralic

I don't really know both brands, but Lumin's system is optimized to work with Minimserver, which is far and away the best music server system for classical music (and is donation-ware!).  So if you have a large classical collection on a server, like me, you'd want Lumin.  It also seems to have more format capabilities (MQA, DSD, etc.)

One major point of difference Auralic is wireless and Lumin is not so take that into account if it's an issue. I needed, and wanted, wireless so went with Auralic. I like their Lightning DS app very much.

I've had the opposite experience with the DS app.  So much so I had to sell it and go with a bluesound Node2i.  Constantly something not working properly.  First it was that it was unable to refresh and it would crash, then that was fixed by the developer after well over a year.  Then the wifi module crapped out, then it started to have to be hard wiped anytime it lost a connection - huge PITA.  I dumped it.  Sounded great though.  Also has a very odd way to access and manage playlists which I found disappointing.