HoW wins for me, but just barely. I thought HoW would be a lot better than it was, but it has just as many flaws as the dark below had.
IMO The Taken King is Bungie's last shot to get it right.
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At first HoW but it doesnt have a raid and rerolling and ascension annoyed me so much. The only thing better about HoW is the little bit of story and Trials