It is hard to answer since it is always a system thing. Coax should be better but is sensitive to ambient noise and affected by transmission line effects (reflections in the cable). Toslink is immune to ambient noise and reflections but might suffer from the system noise, because of longer transitions. You have to check for yourself. In either case cable can screw-up sound by producing time jitter of the signal. Jitter will convert to noise proportional to signal level. When comparing cables look for smoother cleaner sound and better imaging.
Coax should be shorter than 1ft or longer than 1.5m. In first case cable is not long enough to produce reflections but in the second case it is producing reflections (from the end of the cable on impedance boundary) that will miss edge that initiated it (otherwise it might add affecting shape of transition)
Coax should be shorter than 1ft or longer than 1.5m. In first case cable is not long enough to produce reflections but in the second case it is producing reflections (from the end of the cable on impedance boundary) that will miss edge that initiated it (otherwise it might add affecting shape of transition)