When it comes for wires and cables, I have a mental block that got embedded long ago when I read about stray current on Acoustic Revive's website and since then I remain stuck to solid cores be it power cables, interconnects or speaker cables.
I also did lot of experiments with copper and silver and ended up liking the clarity that silver provides. Geometry and laying of wires in the cables do matter but I cannot digest having cables costing more than electronics in my system. Also, with so many brands around, things get confusing and ultimately ending with frustration. So, my golden rules ...lol
1. Get silver if one can afford
2. Get from a good brand - I get it of Neotech*
3. Single strand (solid core)
If not anything, I have the peace of mind that I have the basics and am not altering anything (I think multi-strand, different geometries and insulation do alter the original signal)
*But my speaker cables are 14awg from Tempo Electric because I could not find this thick of a silver wire from Neotech and also, if there was any from Neotech, it would be very expensive and probably be more expensive than one of my electronics which again, I cannot digest.
As for 10 awg for speakers, I tried it too with copper, felt exciting for a few days and I thought that it made music powerful but dull and started going down on AWG finally settling for 14 awg.