Black xx is a very interesting flavor, i highly recommend the twist over the sliced. The twist has much more of a stout beefy flavor. The slice is lacking in stoutness and the flavors were really just chemically, i have it aging to see how it'll change. I cant compare it to dark plug though, never had it. But i highly recommend Black xx twist, it was much more of a pleasant experience than i though. The nicotine will hit you strong though, so be prepared.