Im not sure of your budget but this laptop is a complete beast...it is a bit exspensive..really all depends on what your looking to spend
Razer Blade 17.3" Gaming Laptop - Windows 8
US$2,499.99
Intel® Core™ i7 Quad Core Processor with Hyper-Threading CPU: 2.2GHz (Base) / 3.2GHz (Turbo)
Intel® HM77 Express Chipset
8GB Dual Channel DDR3 at 1600MHz
500GB 7200RPM HDD (Primary Storage)
64GB SATA III SSD with NVELO Dataplex™ Software (Cache Acceleration)
Integrated Intel® GMA HD – Mobile Mode
NVIDIA® GeForce® GTX 660M 2GB GDDR5
VRAM with NVIDIA Optimus™ Technology
Out of the two you listed the i7 machine is stronger. It has a stronger GPU although with either at best I wouldn't expect anything beyond mediums settings in games.
I would say it depends. Do they come with different screens if so is one larger or stronger then the other. Does one have a keyboard you like more. Maybe you could link the two you are considering and that could help things a little to if you would please