Both great albums, but have you spent time with the new Arctic Monkeys album? AM and Modern Vampires of the City were as good as music got this year, in my entirely unsolicited opinion.
Personally I've never really gotten into Arctic Monkeys or Vampire Weekend. However, I have heard from a few people that both of those albums are great, so maybe I'll give them a listen!
Edit: Listened to both albums today. Thoroughly surprised by how much I enjoyed Modern Vampires of the City. Good suggestions!