Digital Coax vs Digital Optical

Whats the difference between the two, and which one gives better quality? I'm looking into buying a 5.1 surround sound set up and my sound card has both optical and coaxial outputs.

For sound Coax everytime, a good quality coax cable will do you just fine, optical is not bad but its not as good.

Co-ax is considered the better choice because it is less prone to a digital distortion known as "jitter".

Will it make a difference in your system? Only your ears can answer that question.