borderlands.
it has more in-depth gameplay and is more free roaming than DA. borderlands has customized weapons as well as unique and special weapons, unlike the boring "material" stats of DA weapons. borderlands is 500x better than DA, i have both and i spent a ton more time playing borderlands than DA. borderlands also has a whole menu to get into multiplayer games, which is when the real fun starts. in DA, if you can even can get into multiplayer (ive tried but couldnt figure it out) all you can do is go into a boring quest line and in borderlands you can do anything (farm exp, do quests, kill bosses for guns, ect.)
all in all, borderlands is better imo.