I'd get some sealed pedals, they feel SO much better. Also have a look at the gusset double six cog, its much kinder to the freehub body than the one-r
Its strong, light or cheap, and middleburn are definitely not the latter.
Go for either, but I was under the impression that the UNO was targeted at XC, it says the DH is comvered for trials/jumping, so I imagine that would be a safer option