From what I've seen so far. The only benefit would be a higher voltage output on the XLR outputs verses Single ended. This in turn may give you a few more dBs of gain.However this may not be the case with all Dacs.
Depending on your preamp's or amplifier's input sensitivity will determine if the XLR output will make any positive differences in sound quality.
Depending on your preamp's or amplifier's input sensitivity will determine if the XLR output will make any positive differences in sound quality.