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Best performance / cost compromise will be copper pipe(K or L) with soldered fittings. Black iron more durable but tougher and more costly install + has condensation/rust problems down the road. Remember not to go too cheap - use some unions so you can easily repair the system - and enough shut-off valves for OSHA lock out points as required.
PVC was banned for compressed air service by Dept. of Labor back in early '90's - don't know if ban recinded since then. Too much of a chance (impact breakage) around tools, fuel/solvents(softening), and auto's anyway.
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