The Mini has an internal DAC but I'm assuming you won't be using it.
To my ears the Aries has better soundstage, more bass response, and more detail.
The Mini though is an extremely capable player, especially at its price point. I'd peg it over the Bluesound Node 2.
Nice to hear this comparison ! thanks for this. Was this comparison in using both as a streamer only and the same DAC ?