I'm no expert on plastic, but I have tried the black and it is easier to see eggs/brood in the cells. Some claim the bees prefer the black over white, but then again if you where going with what the bees preferred, you would be using wax or starter strips.
I don't recall hearing anyone that disliked the black though.
Please update your profile, so he know what part of the world your in, it can be important depending on your questions.