Killzone 2 or Halo Wars: Which will sell more and by how much?

[Slimebeast]

Halo Wars will sell better because it's very frontloaded (remember 4 million people bought Halo 3 first week) but Killzone 2 will win in the long run.

Halo Wars - 1st week: 750,000. Lifetime: 2.6 million
Killzone 2 - 1st week: 650,000. Lifetime: 2.9 million