Power cords matter, but they’re no magic potion. Best way to convince yourself of their worth isn’t to try out a superexpensive one, it’s to try out a really cheap and shoddy one. The falloff in SQ between it and the decently good cord you’re used to will show you they make a difference.
Everything you try, components, cables, room treatments, is going to be system or room dependent. Money doesn’t buy top performance. Top performance comes mainly from correct speaker placement and competent sound engineering. Cables can advance things a little, the same way anything else can, but if you don’t have a lot of money to spend, you’re not missing much from pasing on Odins.
I am always wondering what my system’s’ weak link is. How can one know? That question is worth a thread in itself. If the weak link is your power cords, you’ll think that the mid priced cord you just tried, and that helped a lot, is wildly underpriced. If it isn’t your power cords, you’ll tell yourself the Odin you just tried out is wildly overpriced"
I use unshielded cables from a Lithuanian company (my entire loom). Mid priced. I am delighted with them, though they need some nursing along (de-mag them every second day, and never touch them or move them once you installed them).
Last point — no point chasing high end, high cost power cord or a power conditioner unless you’ve already spent a couple of hundred dollars on a hospital grade receptacle (Wattgate or Furutech). You would be throwing your money away. Quality of the wall outlet matters huge.