Choosing cables is all about synergy with your room (#1) and your equipment (#2).
When I decide to upgrade a cable, I usually test out 4 or 5 (returnable) cables before choosing. Give them all at least 100 hours of break-in time and test them with ~10 tracks that you are VERY familiar with that test sound stage, tonality, transparency, speed and emotion. The one that makes you just want to keep listening is the winner.
Silver cables are definitely the best to me, but good ones (high purity OCC) are very expensive.