For speaker wires I have it easy because Naim Audio insists on using NACA wires for NAP250s and although I did buy a few dozen feet of AQ speaker wires, it is still on my "to do list" to actually try them.
Correct me if I am wrong, but isn't it sooo much easier to just follow the suggestions from your favorite manufacturer than going thru the pains of constant doubt and swapping, not knowing if its the wire or solder joint or skin effect, or non-WBT bananas :-) Depends on the mindset, of course. I still have some fond memories of living in a society where everybody knew what is right and which direction to look (all together in one direction of course).
I "laughed my evil laugh" reading an article in my wife's mag (ART Today or such) that it is liberating for The Artist to have some defined boundaries, set by (totalitarian) society, that somehow it "channels" productive genius! Funny how real life crashes such theories. My point here is: I guarantee there is not a single person on this Planet who tried Nordost Valhalla interconnects resoldered for Naim's DIN plugs! I am free to check if they can beat Naim's Hi-Line, but am I going to pay for this non-returnable freedom? Sorry, but No