You'll need to decide if the price difference is worth it. "Insulated Copper Wire" will usually bring about half of stripped copper wire ( #1 or #2 Copper, depending on wire type. I took a quick look at the prices here for each and on Aug 12th they were:
Insulated Copper Wire - $1.18
#2 Copper 2.30
#1 Copper 2.40
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