Nope... I'm not going to touch that.
Sonic 'preference' is not part of what I want to discuss here, quite so much as technical differences.
-Like with motor oil, no two people are going to have evactly the same experience, specially when it comes to 'hearing' any sound from cable, so -again like motor oil- the subject becomes very 'slippery'.
And -as mentioned earlier- there are VITALLY important circumstantial data which rarely-if ever- get reported...
The 'coat hanger' test (for loudspeaker wire) is a famous one, but I note that you didn't say WHAT was being connected, so we can only speculate as to whether your friend was connecting a microphone to a preamp, a mixer to a recorder, or an amplifier to a speaker... all rather different interface types, imposing distinctly different tests on cable.... Once again, DO NOT make any sort of assumption that just because something works in one condition that it will work in another.
Now, if it happens to be 'amp-to-speaker' cable, I know that-for in-wall/permanent installations I've used solid core 'stove' cable for years (which is about as close to coat-hanger wire as you can easily find in copper) and people swear that it sounds as good as the stranded Mogami stuff... But then on the other hand I too can point to a famous mastering engineer -published and respected, who also designs and builds some fantastic and complicated equipment and well-known in these parts- who made HIS loudspeaker hookup cables out of many sets of CAT-5 cable in parallel, with all of the conductors paralleled and individuall shielded (presumably to accommodate the 'Litzendraht' property) and he swears that it's the best-sounding way...
I'm making no comment. -If it sounds good to you, go right ahead and use it... but don't become obsessive listening for differences; I go my the rule that well-suited cable has never let me down, but if anyone wants to get involved with listening tests, they're welcome to... -It's their time money and sanity, after all.
I can also say that I've made cable harnesses and executed a couple of installations for people who have used similar methodologies to evaluate snake cable; they bought a hundred feet of Mogami 24-pair, a hundred feet of Gepco 24-pair, and so on. They added male and female XLR connectors to each end, and connected the end of pair one to the start of pair two, the end of pair two to the start of pair three, and so forth. -Of course, they end up with 2,400 feet of snake, which they can -by simply unplugging and reconnecting at any pair junction- 'shorten' by 100-foot increments.
Then they did some listening tests. they tried dynamic mics, phantom-powered transformer mics, transformerless-output tube mics, transformer-output tube mics, ribbon mics, then they tried running transformer and transformerless line-level signals through it, as many combinations as they could come up with (and they own a drool-worthy collection of equipment, both 'rare-vintage' and 'ultra-modern')
-They preferred the Gepco, so they ended up buying about 3,000 feet of multipair (this was a particularly large installation, with more to follow!) -I also know people who have done similar tests and gone with the Mogami. -I've another friend who likes Redco. In the end it's what you like, so I can conclude that there is almost certainly no technical backup, so I'd like to keep the thread from heading down that path, other than -*perhaps*- listing things that people have tried and liked. -However, I'm certain that for each thing that someone has liked, you'll find someone else who has had an equally negative reaction. -For reasons of sanity, it's probably best not to invest too much attention in such matters!