The best replacement for copper is pex.

The best alternatives to copper are rated as following:

★★★★★	pex
★★★★	pvc
★★★	fiber
★★★	aluminum
★★★	brass
★★	bronze
★★	cpvc
★★	aluminum wire
★★	aluminum wiring
★	plastic plumbing
★	aluminum heatsink
★	aluminum radiator
★	stainless steel cookware
★	mirena
★	pvc water lines
★	pvc plumbing
	stainless steel pans
	snake river
	platinum spark plugs
	aluminum bus bar
	silver thermal conductivity
	hormonal iud
	brass more expensive
	brass conductivity
	platinum plugs
	plastic water lines
	plastic
	galvanized
	breckenridge
	stainless steel still
	aluminum conductivity
	plastic pipes
	lead bullets
	nickel
	silver speaker wire
	cobalt
	aluminium heatsink
	aluminum crush washer
	aluminum electrical conductivity
	fibre
	steel brake lines
	aluminum cookware
	silver
	pex pipe
	pvc which is better
	aluminum coils
	platinum spark plug
	bronze color
	pex plumbing
	zinc
	fiber optics
	cast iron
	galvanized piping
	mirena iud
	aluminum conductors
	aluminum heat conductivity
	pvc pipes
	aluminium
	silver spark plugs
	pex piping

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Speaking about copper, one probably shouldn't forget about silver nitrate.

Other search terms related to copper and their ratings are:

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copper

pex

pvc