You do know that science can actually explain why one person looks better than another (symetry) and why some foods taste better (chemistry), right?
If you are tasting or hearing electricity - you are doing it wrong. What you hear is the excursion of an electromechanical or electrostatic driver - a speaker, tweeter, or headphone. Unless you want to assert "magic", there needs to be a testable hypothesis of WHY a particular power cord, speaker cable, or instrument cable sounds "better", adn what "better" means.
You wouldn't take medication based on "perception" - hence why double-blind studies are a thing. Why buy cables based on perception? You know your guitar amp is going to sound different from day to day based on changes in your position, supplied voltage, component drift in the amplifier, different pressure and humidity - ESPECIALLY if an older speaker cone is absorbing moisture, and changes in human hearing due to the blood sugar, blood pressure, overall health.