when soloing or tanking as a monk, the dw vs 2h debate is less about dps and more about how much dmg you take. you simply take less dmg using a slower 2h. that's why it's better in those two scenarios.
now if we're talking a dw'ing ntov tier monk, then we're probably talking an accordingly geared ntov monk otherwise as well, and sure whatever content you happen to be tanking as that monk you'll be fine because you'll have a buttload of hp/ac and the monk avoidance.
but between epic/som|sos|ada vs t-staff, the t-staff is just better when soloing or tanking. if the patches go live like has been discussed, it won't need that qualification, either.
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