External CD burner?

For burning high quality audio CD's, is there any merit in a dedicated external (firewire or usb) cd burner, or is a built-in DVD burner no different?
Ya, with an external usually the lens is in the tray when you open it making for easy lens cleaning.
This question also interests me. I've been disappointed in the results I get burning a CD on my Mac. They just don't sound as good as the original. Is it the burner? If so, what should I get?