Specific question choosing Duelund vs Mogami for affordable interconnect

If you use better connectors like Eichman or Cardas and the 16 ga wire, then the Duelund can sounds spectacular. Also, how they are built helps. Proper striping of the stranded wire can be tricky to avoid nicks and such. Proper cleaning off the oil residue on the wire is important. Also, not using too much solder is key.

If you are into Good quality fdelity for one switcraft is junk,Period.
even brass  which many are used gold plated is far from ideal.
a high quality 4-9s plus Silver or 5-9s or better Berylliym Copper 
plated normally far more accurate and musical . Mogami is very good cable for Guitar amps I use it myself but for musicality
itis not a great interconnect ,the Duelund Wire is rich and full body 
not the last word in upper Detail but still much more natural then Mogami in my opinion and experience with both. with a decent quality rca ,or Xlr connectors .the connectors cost more then the wire in most cases 
VH audio for example have recipes as well as DIY audio 
to build your own cables. Currently I am reverse engineering those 
Synergistic Research Carbon Xover purifiers they sell,which FYI
they don’t use anything’s in their makeup what I would even call good Quality IMO.I use the best of the best and take into account your speakers impedance which is a must .they just throw in a  average in resistor size.It either works good,or slightly
it works or it dont . So far my tests show  noticeably better ,but not the eye candy mystery  shell like Synergistic. Just to point out in any type of cable no weak links in the chain if you want the best results.

Heresy alert: depends on your electromagnetic environment.

If you get good cel phone reception, or there are radio or TV transmitters nearby, chances are that you have a lot of electromagnetic radiation in your environment. Some cables may act as antennas to pick this up.

This interference can be attenuated by a woven shield, by the tight winding of the individual wires, or the configuration of more than two wires. Penalty for this is higher capacitance, which can reduce the high frequency audio signal. For short runs of 6 meters or less, this penalty is insignificant; indeed, for many systems it is preferable in that it reduces high frequency glare.

I did not try to reinvent the wheel. I use shielded, 4 conductor microphone cable in a star-quad configuration: Mogami 2534 or Canare L-4E6S, terminated with ETI plugs. Very cheap and very effective.