Coax has been consistently voted as being the better of the two connections. To my ears coax is much better sounding than Toslink.
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Try it both ways. Most systems are not sensitive enough for you to tell the differance. Since there doe seem to be a tilt toward coax, you probably might feel better using coax on your primary feed, which I assume is your CD player and then you can use toslink for your DVD, Satellite or whatever.
My own toslonk is a glass one from wireworld and i use Acoustic Zen for coax.
Cheaper units i.e. many DVD players used as transports benefit from a good quality Toslink in my experience. Compared to an equivalently priced coaxial cable, the sound is typically far smoother and more refined. I think that a lot of this has to do with the fact that many inexpensive "all in one box" redbook players and most DVD players have very high jitter when used as a transport and are also more sensitive to signal reflections on the line. Toslink's don't suffer from this like coaxial cables do. As such, i would try a Toslink if you're in the above boat. Otherwise, a good coaxial cable "should" work better if the gear is well designed and built to the same standards. Sean