Resident Evil: Operation Raccon City OR Batman Arkham City?

I don't know if i should get RE or Batman. If i pre order Batman:Order Batman: Arkham City for Xbox 360 or PlayStation 3 and receive a $10 promotional credit toward the purchase of items shipped and sold by Amazon.com. Also get the Amazon.com exclusive Batman: Arkham City Comic included in your shipment. And it's released on Oct. 18. But RE does not have a pre-order bonus yet. And comes out on New Years Eve. Help me!