I'm getting a new refrigerator - which is best for the ice maker's water line - copper or stainless steel (they both are the same price at Best Buy)? Thanks in advance!

Copper tube for normal install. BUT if you pull the unit out to clean you will have to leave a loop in the tube. Stainless is usually just the outside wrap on flex lines. The flex lines are easy to use. It is a personal decission.