The reason that some manufacturers put the arrow on the wire is because they made the wire and know which way the copper was drawn through the dies when it was manufactured the other manufacturers listen for best sound but i can understand how the sound would be better in the direction the copper was drawn out it is the best explanation i have ever heard about this.
So you think wire conductors in cables are directional? Think again...
Here is a very relevant discussion among physicists about the directionality...the way signal and electrons should flow... based on conductor orientation. Some esoteric, high-end manufacturers say they listen to each conductor to see which way the signal should flow for the best audio quality.
Read this discussion. Will it make you rethink what you’re being told and sold?
https://www.physicsforums.com/threads/is-a-copper-conductor-directional.975195/
Read this discussion. Will it make you rethink what you’re being told and sold?
https://www.physicsforums.com/threads/is-a-copper-conductor-directional.975195/