copper vs pvc compressor lines?

I've read some places to not used galvanized for air because little "flakes" can break off and get in your air stream. But, I would think they would be big enough for a filter to easily remove? I don't know. I have no experience with it myself, just saying what I've read in case anyone else has any add'l experience using it. I'd sure like to know in case I ever need to replace what I have.

I didn't use galvanized myself, just regular black iron, and so far so good. If I had any sort of plastic pipe, I would make my very next expenditure iron for safety.