All I can give you is one vote for single ended.
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If that blog is anything like the sub article my impression is that's time you will never get back. If anything in there gave you the impression you can buy based on construction then not only will you never get that time back but it actually set you back the untold hours, days, years it may take to unlearn all the massively misleading misinformation.
Forget shielding. Forget wire. Listen to how it sounds, and how others say it sounds. Period.
Now that was an interesting link!As to power cord shields. AC power cords can sometimes act as interference antennas (either receiving or transmitting). Decades ago, many printers and desktop PC's had shielded cords. If the shield is connected at both ends it acts as a Safety Ground/Protective Earth and carries the same noise/leakage/interference currents as the Green/Yellow wire. So connecting it at one end, it only acts as a shield. But I would only connect it at the component end, so it can act as an extension of the chassis.