from the perspective of a moderate stats whore ( 😱 ), there is no way to make a mark in the UD stats, there are just too many HUGE players in that arena
also, again from the stats perspective, the scoring system that UD uses is bull$hit/crap/sucks monkey butt/can be easily manipulated to get super high scores with little production.
on the science side, i can't say which one is "better" , i have no clue
ps, i do both projects, i have my wife's Athlon 850 on UD and a couple of faster athlon's at home on D2OL (at the moment)