Cuprajake You say "cables", do you mean mains cables, or instrument/ interconnect cables?
I used to keep a couple of cables and a small amp by the bed, so when I woke up, I would play a bit, then start the day. Some days I suspected the amp, or a tube/valve was playing up, I'd start trying to fix it, only to find nothing wrong. Then I found, to my considerable surprise, the clearly audible difference depended on which cables I picked up.
Cables used in hi impedance (hi-z) situations have a massive effect on signal, usually capacitance is the thing to look out for, but some low capacitance cables can be dull too, all high capacitance cables will be dull, so it's a bit complicated. Decades back this was a big driver in performance microphones going away from hi-z to lo-z, manufacturers even used to specify max cable lengths for hi-z mic cables with their mics.
Anyone who can hear can tell the difference between 2 very different hi-z instrument cables by their sound, price may not be informative at all however. Preference is in the ear of the beholder. It's like the difference between brewing coffee with RO water or Vittel, or Buxton.
The difference between 17.8g and 18g (all else being equal) - this is a straw man fallacy, no one ever said they could, it's a difference of 1% in just 1 parameter.
A cleverer man than me once said the differnce a thing can make is dependent in how much difference and how many states that difference can be seen in. A cable has more states than just coffee dose and capacitance varies by way more than 1% for cables of the same length.
