rca?

Hi Folks, Got a DSP2411p and an ECM8000 (plus behringer mic pre=amp) on its way. I will be connecting the DSP2411p between a Velodyne Sub and a Rotel RSP1069 processor (RCA inputs/outputs). What would be the better connection type, XLR-RCA or 1/4" to RCA? Or does it even make a difference...