I haven’t used either the Audioquest or Shunyata. I did however use Signal Cable when I first started out with switching out stock power cords; my experience with the equipment I had then that the Signal Cable offered no SQ improvements. Yours or others mileage may vary
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I apologize ahead of time because I'm not directly going to answer your question, which is something that I dislike doing. If you are dead set on one of those three brands have at it and I hope you get some good answers to your question.
For a little more money ($50) I would recommend the Raven Audio power cord, with free shipping and a 45-day risk-free guarantee.
A lot of bang for the buck and very well made. Check out reviews on their website. https://www.ravenaudio.com/product/power-cables/
A few things to consider in some of these choices is application. Pangea PC’s are very stiff, as are Audioquest. If you have any back wall spacing issues, cables like these can present a very real problem. Part of the reason I recommended the ones I do are they are generally flexible given their girth. A significant consideration in the discussion of PC’s. Another option is build your own, at a similar price point you can have higher end connections and excellent quality cabling. It’s fairly easy, and fun. VHAudio is a great source as is Parts Connexion. While you are at it, spend a bit of money on replacing your receptacles. PS Audio Power Ports are a good start, but there are tons of options. They make a difference!