Mass Effect or Assassin's Creed? Opinions

I'm thinking of buying one of them. Which one is better?

Mass Effect, a massive un-repetitive game.

I might be able to play AC one more time (2 total) but ME I've played a total of 6 - 7, and I have to play it again on both the 360 and PC in anticipation of ME 2... both have good stories but ME is better in my opinion.

definently Mass Effect.

Both are good games, but you'll put far more worthwhile time into Mass Effect even assuming you only play it once.

-Byshop

Mass Effect. Hands down. No question about it.

both are great, but you will find 100X more value in Mass Effect.