If you're trying to do a serious clone of something, I would try to get the II. Northern Brewer has it, and the Grape & Granary. Otherwise, use either or a combination--I'm sure it will still be good. They're really not a whole lot different, besides, how much are you adding, anyway? If you want it more mellow, you could use the lighter (plus maybe add 20-25%, so if you were going to add 4 oz, add 5 instead). Or if you wanted more of a burnt taste, use the darker.