What is the best copper for mains cables ?


With Acrolink Oyaide, Furutech, Nanotec, Neotec all claiming the best purity of copper for mains cable, which company is actually correct ?
If i have not mentioned any other company claiming their copper is best to provide electricity to our equipment please bring some more companies to the discussion.
Is there a best copper ?
Or are they all good just different ?
I am not talking cable geometry, filtering or insulation, just the best quality copper for mains cable duty.
Even if you do not buy into the marketing of these mentioned companies, please offer your opinion, Thank you.
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Showing 2 responses by mechans

I liked using Jena cables for my speaker wire. I could only afford the cheap one.  She says ALL COPPER is CONTINUOUS CAST and the wire buying public has had the wool pulled over their eyes. Don't argue with me argue with Jena Labs. I think they braid their own wire but doubt they make it or its dielectric, which is thin transparent plastic cover on the copper.