Well one is a cover shooter, the other has you killing hundreds of zombies as an even b-movier Zoltan cosplay using chainsaws, buckets and flame throwers.
I say pre-order DR now then when your credit card statement's out, drop cash for QB
It's not a cover shooter. It's pretty much in the vein of Max Payne 3 or Vanquish, where you COULD play both games like a cover shooter, but if you did for more than just a quick breather, you were doing things wrong.