An electrician I know once told me something that I never forgot. He said that all copper wire is the same -- the only difference is solid or stranded; but not a huge difference between the two as far as performance goes. As far as what makes one wire better than another -- it is the quality of the insulation that everyone is talking about.
So yes, you want to get the best wire -- you want the best insulation you can get. I do not know the difference in insulation, you'll have to do a little research on your own for that.
Best of luck,
Mark
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