PETEREK
Member of the Trade: ThePETEREK on Etsy
Previously known as cCasper TFG
It comes down to cost man. If you want something easy to use, Mogami W2893 is great for people just getting into cable building. If you want something fancier, look at any of the boutique shops that are known for making cables themselves, most will have a "DIY" section and sell certain wires of theirs by the foot. There are some good options on eBay (Lavricables?). I know @Whitigir
swears by some of the silver he gets from someone on eBay. Again, it comes down to cost and also aesthetic preferences.
But Mogami W2893 is 4 strand, don't I want something 1 strand?
You're wanting to make RCA-RCA interconnects right? That's what I assumed. Mogami W2893 is 4 stranded, but you can still use it. If I were to use it to make RCA-RCA interconnects I would use the black and clear wires as the ground (sleeve) and the red and blue as the signal. just twist them together and solder two wires to each the ground and the signal. I normally don't use the metal sleeve on quad cable, I just strip out the wires and use those. I used to use W2893 all the time the way I just described.
Edit: this is for each channel. You would have to do the same exact thing on the other channel, so there would be 2 interconnects.