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Coaxial vs optical digital cable in DVD application:
The question you pose is one that has been endlessly debated by audio enthusiasts for years. Some prefer one over the other while others say there is no difference at all (how can 1's and 0's sound different?). In the end, it's really just personal preference. There are a couple differences to note about the two formats: Optical is not susceptible to most outside interference sources, like RF and power surges, which helps make it the better choice for long lengths. Also, optical cables are generally less inexpensive than a quality engineered coaxial cable, which is more expensive to produce, and both formats deliver comparable results.
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BOSS