well you would be getting either for one for different reasons. MW2 has a good but short single player experience, which is complemented by a good competitive online experience (ie you face other teams or play in an FFA against others).
Borderlands has a robust single player experience that, if you do all the missions, will take a lot longer to complete than MW2. You can also run through this single experience with friends online, and this is a lot of fun. Borderlands does not have competitive multiplayer so there's no versus modes or anything of that sort.
So it really depends on what you're looking for because they're both great games in their own right. With MW2 once you finish the single player, that's it. The only incentive to play through again is to beat it on a higher difficulty or for achievements. Borderlands encourages you play through again after you beat but this time all the enemies are of higher levels of difficulty and you find better weapons and more rare items. On Borderlands you can also go through as a different character to experience the game with new powers and weapons and things like that.
Basically it boils down to single player vs. multiplayer. Which is more important to you? Personally, I enjoy playing MW2 because I love online multiplayer games, but Borderlands was my favorite game of the year. It just had a uniqueness to it that was well executed and a lot of fun.
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