It's preference. I have listen to silver cables and loved them because they bring out the high end particularly cymbals like Bob mentioned. However a good copper cable can do the same. I have found that the mixed strand cables seem to sound the best. I don't know your age and don't want to sound fatherly but years ago for a cable to be considered decent it had to have some silver. Then prices went through the roof and everyone started using copper to keep the prices reasonable. Today most manufactors use silver, gold, or a mix of copper / silver in thier high end cables. You may want to experiment with some hybrid cables like Siltech which uses silver & gold. They have a very natural sound compared to straight copper or silver. Something also to think abou is placement in your system. If you have bright interconnects, you can tone them down by your selection of speaker cables. I use bright interconnects(silver/gold) with copper speaker cables which are fairly large. I am working up to Kimbers 3035's which uses silver on the positive and copper on the negative. There next best speaker cable is all silver.What does that tell you? In any event the beauty of this hobby is that what ever sounds good to you make's it right for you.
Enjoy the music Woodman.
Enjoy the music Woodman.