Audioquest or Nordost for speaker cable

Unfortunately, no one's opinion here will do you much good.  Everything in your system - and some things outside your system, e.g., power grid quality - changes the sound.

I've found the only reliable approach is to borrow the cables you're considering, preferably from a local dealer but from an online dealer if necessary, break them in for 200 hours (8 days of 24/7 playing) then play 8-10 of your favorite tracks and see if you like it better.

I've tried cables that everyone else raved about that were harsh or thin or lacking bass punch in my system.  You just need to try other cables and take systematic notes.

@soix - great question. Before I was using Cardas Clear Cynus. Those are great cables and I still have them. The Cerious cables have so much better clarity, detail, and expanded soundstage. Not to mention the noise floor was greatly reduced. I can’t say enough about their cables. I also have a Lumniscate PC and love it too. I’m going to replace my Cardas Clear Cygnus XLRs with the Lumniscate or the Matrix after I replace my speakers in the next month or so. Reach out to Bob who is the engineer. He is the nicest guy you’ll ever meet. 
 

Also, there are tons of discussions here on Cerious cables. 

Just last month I home auditioned Nordost Heimdall 2 and Audioquest Robin Hood Zero side by side. In my setup I preferred the Audioquest hands down. I was really surprised. In fact, before the audition I was planning to buy the Nordost - I had expected and wanted to prefer them but it was no contest.  So yeah - best to listen in your own system and judge for yourself

As had been said there are just too many variables at play here starting with you the listener. I would borrow some cables and try them out in your system and see what you like. I have used the Cable Company for years and have gotten good advice as well as the ability to listen to many different brands. When I first started borrowing cables , I was surprised how many well regarded cables just didn’t move the needle for me. I have a borrow coming in from the Cable Company Monday and over the years I have returned more cables than I purchased but I got a lot of good information.

IMO, find cables you’re interested in, test against your factory cables. No difference toss the crap. If you find cables that out perform supplied stock those are winners, take the best. Give it a day or two try the test again. Pay no attention to the burn in crap, besides if there’s any legitimacy to it time will only make it better right ?? lol.  
You be the judge, other opinions will likely lead to indecision and frustration. 
 

Cheers