The extended response of the S version seems to be the consequence of the slight hump (0.6dB@55kHz). I would think REW would handle this difference easily.From what I can tell the 9038SG3 has balanced outs on TRRS , the 9038D has regular TRS unbalanced .
9038SG3 also has wider frequency responce +0.1/-0.3 @ 100khz compared to around 80khz -1db on the D variant .
I've been questioning myself about the possibility to order one of these, because the Cosmos DAC doesn't seem to be available soon.Astonishing that a DAC the size of your thumb and USB powered can perform so well , battery powering the ADC or DAC via a standard USB power bank and y splitter cable is also possible .
I think I'll stick with my E30 for the time being and wait till it's available.