I have used silver and copper interconnects (Source & DAC) and RCA (AMP & DAC). For me I preferred the silver (better clarity/openness and low end) over copper. That being said depends on
1. your overall system (Sometimes silver can make your system sound bright)
2. You overall cabling (e.g. Im planning silver end-end, interconnects + Speaker cables)
Best is to check your system with both and decide