My take is, buy the cheaper cable now. If for some reason it's not really 1.3 compliant, by the time you need it, if you do benefit, 1.3 compliant cables will be cheap. Paying several times more now, for the hope of future compliance, doesn't make sense.
For 3ft to 6ft, I really don't know if it would make any difference.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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My take is, buy the cheaper cable now. If for some reason it's not really 1.3 compliant, by the time you need it, if you do benefit, 1.3 compliant cables will be cheap. Paying several times more now, for the hope of future compliance, doesn't make sense.
For 3ft to 6ft, I really don't know if it would make any difference.