RCA or Optical?

Which sounds "richer"?
A53b3ef9 6737 49d0 9eb5 92575cdebc00jwilsco
Does not matter if working properly.
Does not matter if working properly.

Does not matter? The audiophile police are watching you.
I've used both over the years and NEVER been able to tell the difference.
I've used both on half a dozen Dacs and have found even a cheap RCA sounds better than a big-buck optical.
I recently reconfigured my system and came up short with my vintage Audioquest RCA (true 75 ohm) digital cable.
I substituted a generic Toslink and thought there was substantial improvement. I purchased a glass fiber Wireworld Toslink. I like it but can't get it to pass 24/192 data to a Rega DAC (it's 3 meters long BTW).