The XLR outputs on the stereo version appear to be "convenience" outputs for those using XLR cables but not really carrying two symmetrically balanced/inverted signals.Which to me says the rca outputs should sound just a bit better than the xlr.
Because the signal doesn’t then have to go through a "rca to xlr conversion circuit" be it opamp or discrete based, most use opamps for this kind of pseudo xlr output.
Cheers George