Copper, absolutely!
The benefit of CPVC is that it is quick and it bends much more easily. But copper will last much longer, looks better and has a much more professional appeal to future potential buyers.

Best

Bruce M

I don't necessarily agree. In the state of Florida everyone is moving away from copper because of problems with pinhole leaks. I have heard two different causes for the leaks: lightning, or harsh water that leaches the copper away. Most houses in my neighborhood are only 18 years old but all are getting pinhole leaks or have already replaced their plumbing. In California, you can expect copper to last a lifetime, not here.

What I am curious about, though, is what to replace my copper plumbing with (yes, I have pinhole leaks). I have been told to use CPVC by two plumbers and to use PEX by two other plumbers. Can anyone tell me more?

I have to agree with Bruce - Only because I have never experienced a problem with copper other than freezing, in which case both would crack... If I were in your shoes I would definately request copper. It is by far more robust and does add an plus to potential buyers in the future. Good Luck