I think both had their merits, but really I can't compare them, they may be in the same franchise, but they really do play like totally different games imo. FO3 really pushed the post end if the world setting, and thats what I really loved about it. New Vegas, that post end of the world aspect didn't really play as much of a role....at all.But it made up for it with some brilliant quests and story telling But....I really can't compare them beyond that, which is funny, they're so similar, but so different in my eyes.