This may sound a little goofy, but I find the terminal ends have the most prolific effect on sound. Cables sound different but terminal ends and how they are attached to the cable really make a difference. NO SOLDER. Binding screws that are like metal or thick clad if copper is plated. I pay close attention to the pockets where the cables are joined to the terminal. I pressure join or use screws, no solder.
Red copper
Red copper silver clad
Pure silver
I stay pretty close to that too.
I also find it's the cover more so than composition in copper too. I can't tell the difference when wiring sub/bass with OFC vs OCC. Mids with teflon, pretty close.
Good OFC is GOOD material if you pay attention how it's drawn threw the die, terminal ends, covers and NO solder.
I've been using a HiOCC/teflon 16-24 strand weave that is top of the line. It's a plug and drop cable to, 50 hours tops 100 hours you know what it's going to sound like forever.
Regards