Black cds are for looks. Personally I have never used them. Last time I checked they were more expensive. Some playstation cds can't be read in some drives because of the reflection. I have to say I haven't heard other people say that, but I know the toshiba dvd built in to the laptop couldn't recognize a psx cd.
Here is some stuff the makers of them say:http://cdrinfo.com/burnerscorner/black_cd.shtml
Basically in short, the only reason to buy black media is the Ultra Violet protection if you leave your cds sitting in the direct sunlight all day. The qualify of cdr depends on the manufacture and the organic dye layer. I recommend getting the Fuji http://www.fujifilmmediasource.com/cdr.asp
from officemax since it is the best I've used and they're like $12.50 for 50 of them.