RCA or Optical?

+1 Kijanki. I have a very long run (8'+) from my digital cable box to my processor. The box had a bad SPDIF output, so went with an armored TOSLINK. Works perfectly. On the short run from my BD to processor, I found the TOSLINK far more listenablein my Mc gear. Having fun and happy listening are the goals, after all.

I use 2 AQ coax...VDM3 from the CD player to the DAC, and a VDM5 from my
streamer...they both work very well, and although they're different lengths and
designs (the "3" is silver coated copper, the "5" is solid
silver) they are absolutely indistinguishable when switched, which means they
suck evenly, or they succeed evenly, or I'm an idiot (most likely).

Optical are a pain to plug in behind a rack....