I spoke with one of the designers at last year's Festival du Son in Montréal, Canada and asked him which one is better. He told me that the machine is single-ended, the balanced output is generated through a device. So, for short runs, RCA should be better, but if you use it also as a preamp and run a long interconnect (as I do), he told me the XLR would be better. In the end why don't you listen to both and choose the one you prefer, trust your ears.
