The way DoC works right now (I can only speak for a 25man environment) is that it allows, with some good rng, for some absolutely massive sub 25% rips which will amplify its effectiveness compared to HotW. However, I play DoC because I enjoy the challenge that it presents over HotW and the reward you get if you pull it off. There are a few parses out there where even HotW has destroyed DoC where you wouldn't expect it but a lot of parses are down to lady luck being on your side along with you being on your game.