XPS non DR v DR on NDX2 SQ difference

Hi. I am planning purchasing an XPS for my NDX2. I would like to know the difference in SQ between DR and non DR version of XPS. I couldn’t find the answer by searching the forum (not specifically on ndx2). The rest of the system is not that important as I listen mainly on headphones these days (headline, hicap, moded Denon 7000). I am expecting the DR version to be better but being almost twice the price of the non DR version (on the used market) I would like to know if someone done the comparison and what are their findings.
Thank you