Personally, I would use copper, just because it has been time tested to be reliable. Pex would be next on my list, but I'd have to research the best kind of crimpers/clamps again and see how they are holding up. I don't care for cpvc for water supply lines. I just don't trust glued connections for pressurized pipe. I know the cement isn't really a glue so to speak, but I just would worry one of those joints wouldn't get applied correctly. Just my opinion.
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