Hi Slappy-
I've used various brands of both types. I will say that I have found a very good Toslink (re: Van den hul, Wireworld glass) is better dynamically than many of the coax's around (re: Signal cable, Stereovox, Vampire wire, some others). But, a very good coax will provide a bit more bottom and a bit fuller sound, depending on electronics of course. I no longer use an "official" coax. I use BEL-the wire, the same interconnect I use for 2-channel stereo connections between CD/DVD and receiver and Satellite/receiver (system 1) and preamp/amp (system 2).
I've used various brands of both types. I will say that I have found a very good Toslink (re: Van den hul, Wireworld glass) is better dynamically than many of the coax's around (re: Signal cable, Stereovox, Vampire wire, some others). But, a very good coax will provide a bit more bottom and a bit fuller sound, depending on electronics of course. I no longer use an "official" coax. I use BEL-the wire, the same interconnect I use for 2-channel stereo connections between CD/DVD and receiver and Satellite/receiver (system 1) and preamp/amp (system 2).