Let say that there are theory and reality.
It's true that they both carry 0 and 1 but this don't prevent against errors (it's like ripping an audio CD, all programm won't give the same result, despite this are all 0 and 1).
In theory, coax is better on long range (more than 1.5 meters) but else optical is better because of less loss of information and better protection against external phenomena.
But in reality you won't have any problem, whatever the format you use, except with some very few decoders.
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