there is not necessarily a difference in quality of the sonic presentation between an interconnect with RCA vs. XLR terminations. The only difference is that the XLRs will typically give you a 6db gain over the RCAs, so at the same volume level, the XLRs will sound louder. So the difference in sonics will depend from IC to IC based on material used in cable, cable design/geometry, cable shielding etc...Only way to tell is to try out various options in your system.
