Which laptop is better for dawn of war 2?

Both will run them fine, but I'd go with the G505s simply because I like the GPU better.

First of all. Here are the requirements for dawn of war 2:

Minimum Requirements
* Windows XP SP2 or Windows Vista SP1
* P4 3.2 GHz (single core) or any Dual Core processor
* 1 GB RAM (XP), 1.5 GB RAM (Vista)
* A 128MB Video Card (Shader Model 3) - Nvidia GeForce 6600 GT / ATI X1600, or equivalent
* 5.5 GB of Hard Drive space

Recommended
* Windows XP SP2 or Windows Vista SP1
* AMD Athlon 64x2 4400+ or any Intel Core 2 Duo
* 2 GB RAM (XP and Vista)
* A 256MB Video Card (Shader Model 3) - Nvidia GeForce 7800 GT / ATI X1900, or equivalent
* 5.5 GB of Hard Drive space

Both of the laptops you suggested all have a good processor, good Memory, good operating system, good hard drive,. However, they both have Intel HD integrated graphics which is poor and I don't think will run that game well.
With your budget, I recommend that you get the HP Pavilion g6-2210u as seen at the link below:
http://www.amazon.com/...009AU2JIC/
This laptop has the AMD Radeon HD 7420G Discrete-Class Graphics which has 2029 MB RAM /memory while the game ''dawn of war 2'' requires A 256MB Video memory.
Go for the HP.