Which one of these two laptops to get?

[NanaMarakuda1]

Hello, my mom is getting me a laptop and its a very rare occasion.. so i need to know 100% which one is better. And please tell me if your pick can run any new games?

Alienware M11x:
* Intel Core i5-520UM, 3MB cache, 1.06MHz
* Windows 7 Ultimate 64 bit
* 11.6´´ WideHD WLED Display
* 1333x768 (720p)
* 4GB DDR3 800MHz
* ? 500GB 7200RPM
* Nvidia GeForce GT 335M, 1GB
* Wireless a/g/n
* 6 cell battery.

OR

Dell Studio XPS 15 L501x:
* Intel Core i7-740QM 1.73GHz
* Windows 7 Home Premium 64bit
* 15.6’’ Full HD TFL LC
* 6GB 1333MHz DDR3
* 640GB 7200RPM SATA
* Nvidia GeForce GT 435M 2GB
* DVD +/- RW
* Wireless, Bluetooth
* 6 cell battery