Tomb Raider or Assassin's Creed III? (Done)

Hey,

Just saw a great deal for both of them, and decided to get one of them.

Nothing specific, but my freind has ACIII so, if I got it I'll play it for longer.

Can't decide. What do you prefer, Assassin's Creed 3 or Tomb Raider?

(No giveaways, sorry.)

Edit: Thanks for your suggestions, guys. But another question about them, which MP's is better? I'll stick to the one which is more fun, since when I finish the game I'll have nothing to do but Multiplayer.

Edit 2: Thank you so much guys for helping me decide, I've bought Tomb Raider from Amazon :) Have a nice day!