i would think they are both quite excellent, i think you would be happy with either - if you are a roon user, i would mention though that iirc some do believe that auralic handicaps sound quality slightly if roon is run through their streamers as a roon endpoint...
i personally have the optical rendu feed from the fmc port of an etherregen, sound is excellent -- tried network acoustic eno filter, barely perceptible difference in sq