Comparisons between the Grimm and Aurender in my system were Roon for Grimm and Conductor for the Aurrender. I doubt that has a significant sound effect. My experience is that it is the hardware that matters. Also, I used to own an Aurlic Aries G2… I concur both the Aurrender and Grimm are much better sounding streamers.
I use the AES output on my Aurender W20SE and the USB output on my N100. Switching between the two on my main system… when using my Audio Research CD9se DAC and a Berkeley Alpha Reference DAC showed little difference in sound quality but the determinate will be the quality of the DAC / streamer… in some combos USB may sound better… but typically AES will sound better. .