Objectively from my empirical assumptions :
-silver wire conduct better than copper (7% more) -> better sound
-OCC produces wires with larger crystals and less boundaries between crystals ->increase in sound quality
-Silver plated wire tend to be birther than any of the pure wires.
-tin plated wire tend to be not as bright than any of the pure wires.
- wire diameter does not affect directly sound quality but changes the tonality of the wire because the resistance of the wires varies with frequency. A larger diameter wire will have more bass (lower electrical resistance in the low frequencies compare to a cable of smaller diameter) , hence wires are a form of ton control and serve to achieved synergy with other component of the system.
multi-strand wire tend to have a tonal behavior some where between the equivalent solid core wire and the corresponding litz wire because every strand is not always in contact with the other all along its length.
-Sound clarity, speed and low level details are function of the dielectric material used to insulate the conductors. Less dielectric or more air in the dielectric provides more details, speed and clarity.
Hence, when choosing an interconnect start with what you have and ask yourself what you want in terms of tonality: more or less bass, more or less highs and choose a cables with conductor of larger or smaller gauge than what is in your system. Then from cables using similar gauge wires (of occ silver or occ copper) chose the cables with the less dielectric material to audition on your system.
