Nexus device or Chromebook?

I'm thinking of either getting a Nexus 7/10 or a Chromebook. The prices of the Chromebook are similar to the Nexus 7 and 10. The wifi only Chromebook is $249 (about same as Nexus 7) and the 3g model is like $329 (close enough to Nexus 10). So, my question is which one do you think I should get?