I'm using the Parsec coaxial cable going from my streamer into my DAC. It sounds good. Compared to Toslink, it's very slightly warmer and the highs are ever so slightly rolled off. One would never notice those differences unless you were doing a head to head, because again, the differences are very slight (less than 10 % difference for certain).
Would the differences be greater if I were going from my DAC into my preamplifier? ... that I'm not certain.
Hope that helps.