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They both launch on the same day, one has had extensive beta testing, one hasn't...
PS2 still has a lot of bugs and still has lots of content to add before launch, which will cause bugs, so can they squish them, they have the resources too do so.
DF however, we have no idea what nasty bugs lay in wait, as there has been no proper beta going on, a handful of players at most from what we know.
For me currently its PS2 > DFUW.