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This is a more complex problem than perhaps you first thought.
Digital signals experience no interference as such; you won't get static or any sort of a hum. This is because the signal is coded into binary 1's and 0's, which either get through or don't. If they don't, then they will be retransmitted. In short, you will get out of one end exactly what you put in the other end with no loss.
Analogue signals, even balanced ones, are prone to interference. Electromagnetic radiation (radio, TV, microwave, whatever) and magnetic fields, such as those produced by mains electrical cabling, can induce a (small) current into the wire which will affect the signal coming through it. This equates to interference (static and hum). However, balanced signals (balanced XLR and jacks) are designed in such a way that the interference acts on the signal twice, but in opposite directions simultaneously, thus cancelling each other out, and only very very small amounts of interference gets through.
Now we come on to the subject of digital encoding. Some digital signals are better than others. This depends on both the bitrate and sampling frequency used, and the quality of both the analogue to digital converter (ADC) at one end and the digital to analogue converter (DAC) at the other end. The quality of ADC's in DJ mixers is *invariably* shite, and will only encode at 44.1 kHz with 16 bit samples. This is the same as a standard CD. This is arguably worse than an analogue signal from a mixer (there are many many threads on this subject), and for proper professional digital recording you should be looking at 96 kHz and 24/48 bit samples.
Bearing in mind that to use a digital signal you must first convert the analogue signal into a digital signal (which loses some of the quality of the original) and then convert it back to analogue to send to the speakers (which creates more loss), keeping in mind that balanced analogue is very resistant to interference and noise, I would personally go with balanced XLR's rather than optical coax.
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