Hi,
The Lumin and Auralic (Aries) are not exactly the same thing, as the Lumin has a DAC, and the Aries doesn't. The Lumins are comparable to the Linn units, which they have liberally copied the concept as well as the execution.
That said, I haven't heard any of the Lumins at lenght. The Aries, though, is a solid unit, and delivers way more than its price indicate ($1600 w/ linear PS). It's also very flexible, with AES, SPDIF and USB outputs, does Quad DSD, and has Wi-Fi (that sounds better than Ethernet too!)
Since they both use the OpenHome protocol, you can use Lumin's app on the Aries, but not vice-versa, as Auralic has restricted compatibility of its Lightning DS app. Of course, both apps/units will do Tidal natively.
Hope this helps
cheers,
alex