For me the job of the speaker cable is to be transparent, neutral, adds no coloration, simply adds nothing to the performance nor takes from it. Over time I have had lots of cables in my system.
Canare 411
Belden,
Signal Cable Silver Resolution 4 strand pure silver with 4 strand OFC (excellent and not stupid expensive)
Raven Audio
DH Labs Silver
Zavfino OCC
All have the qualities sited above.