What's better, one conductor or two conductors for an RCA interconnect?

more is better

always

To clarify, I understand that there is one conductor, generally copper, and a shield which I guess also is considered a conductor. And then there are cables with 2 conductors, each a separate strand separately shielded. And then a third wire of sorts that acts as a drain or a ground.

Is it better to have two separately shielded wires, which I guess can have multiple strands twisted around each other, versus a Single separately shielded copper wire?
 

Higher extremely expensive analog interconnects have two conductors Plus a separate wire serving as a ground.  If it don't matter for rca Cable purposes, ie. Unbalanced, why is it done. Presumably because it increases quality, and if so, why?

There are quality cables available in a multitude of designs. Pick the cable that sounds right not by the design.

Greetings 

If you have only one conductor that is a coaxial cable which is used for hooking up a antenna to a tuner or your cable TV or communication hookups.

It probably would work but interconnect cables (RCA/SE) are 2 conductor with or without shield. Everyone of my RCA cables are 2 conductor. Some have shields some don’t.

Try the Cable Company for a loaner RCA/SE cable so you can hear the difference for yourself.

Joe Nies