Copper?
I don't really care about the waste water side, but there is probably longevity concern. Plus you don't have to worry so much when installing cabinets and goofy shit like that. I've seen cabinet screws cause leaks in plastic pipes. Good times. I'd rather have metal too. I want the bulk of spending to go to the really important stuff (plumbing, electrical, etc). Everything else comes last for me. Might mean a smaller house, which is fine.
Copper and stainless.
I care about the discharge, too, since I will be on septic, and that all goes to the land. It matters more than ever before what the inputs are to where I live. This is a radical responsibility. There's no remote processing done on waste. You deal with it yourself. It will take time and effort to learn, but I think that is worth the lesser to non-existant so-called convenience.
Yeah good point. I'm not sure how much the pipes actually affect cold water. Or hot for that matter. I'm just assuming it probably has some shenanigans going on. If nothing else I absolutely can taste it in many coffee makers. I almost puked the last time I drank from one. It was heinous. Probably the cheapest shit they could buy.
