I tried Aurender, but ended up going with the Innuos.
Zen Mini MK3, and Zen 3 are in my systems. Both work perfectly with Roon.
Like most things digital, going up the ladder means improved resolution. But, if you are constrained by finances, the Zen Mini is very capable. You can forgo the external power supply by using a really good power cable like the Audioquest Thunder/Tornado/Hurricane(though it probably costs as much). And using resolving USB cables like the AQ Diamond also upgrade the sound.
I really hate pushing more and more expensive items, but, from my old ears, you really do enhance the sound quality when you add these 'tweaks'.
Bob