TOSLINK OPTICAL cables

A good glass fiber toslink will have more resolution than standard monofilimant.  Recommendations are Lifatec or something like Wire World Supernova.

But in general, a good COAX cable will be better than toslink.

I have definitely heard differences between a low cost plastic monofilament toslink and a Lifatec glass fiber toslink.  I have heard differences between both toslink types and various COAX cables.  It really depends on your ears and the resolution of your audio equipment.