copper vs pvc compressor lines?

lowbudget said

My plan was to run 1/2" black pipe but the price of the Northern Tools kit was too good to pass up. I know what I will be doing days off!

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I am really lookin at that kit too. I like it a lot. I would want the 3/4" I think though, because I have my media blaster on that compressor and if I do any painting, it will also be done on that compressor. The small portable I have only has a 30 gallon tank and that's not enough volume. My big compressor is a 120 gallon tank.