Just for info...I have tried both Coax and Toslink and I have convinced myself that Toslink is better. That however is a decent glass Toslink from MG. Not because I was getting earth loops as Mark says, just because it sounds better to me. How...it just sounds smoother and less gritty/harsh or whatever you want to call it. Dont discount either from your list, try then buy if posible.
If only it was that simple
Main System :
Quad II/40 amps, Music First passive pre, Tannoy Stirling SE speakers, Technics 1200 + RB301, V-LPS, digital streaming from Mac mini via Lifatec Toslink to Moon 300D. Meier Corda Arietta headphone amp, Sennheiser HD650 Phones. Mark Grant i/c cables. Speaker cables, Audioquest Rocket 44 BiWire.
Ray.