Out of those two, I would go with the ASUS N53SM-ES72 because of its significantly better display. The Samsung Series 7's 1600x900 display has poor image quality due to low contrast, but it does have a decent resolution for its size (1600x900 - contrary to what you listed)
However, if you would like a faster GPU, then consider the Sager NP6165. It has a NVIDIA GT 650M.
Do keep in mind that the screen in this model is glossy, while the screens in the laptops you are considering are matte. However, you may upgrade to the excellent 95% NTSC gamut anti-glare display if you so choose.
Don't hold it to priority to get a Core i7 processor unless you have a particular need for one. Gaming is bottlenecked primarily by the GPU.