Macbook Pro 17' , Alienware M15x , Dell XPS 17 which one should I get?

Question

Which of these should I choose? I will do some video editing, gaming (not a lot), and of course listening to music. Would the Macbook be able to do some video editing and limited gaming?

Macbook Pro 17' Specs: 
-Intel Core i5 2.53GHz
-4GB Ram
-NVIDIA GeForce GT 330M with 512MB

Alienware M15x Specs:
-Intel Core i7 740QM 1.73GHz (Turbo Mode 2.93GHz)
-6GB Ram
-1.5GB NVIDIA GDDR5 65W GeForce GTX 460M

Dell XPS 17:
-Intel Core i7 740QM 1.73GHz (Turbo Mode 2.93GHz)
-12GB Ram
-NVIDIA GeForce GT 445M 3GB 

Battery life and hardrive size are not important to me. All of them have hardrives at 7200RPM. If it can I want the Macbook Pro, can it video edit and etc? PLEASE GIVE ME A DETAILED ANSWER! THANKS! :D
10 minutes ago - 4 days left to answer.

Answer

The Alienware is going to have the best specs. The GTX460m is the fastest video card of them all.
The XPS has a 3gb video card (which ive never heard of) so it may work well for video editing. 

The i7 is going to have better encoding power than the i5. 
Macbooks are widely used for media creation. Apple makes a great product, but always overpriced.

Macbook Pro 17' , Alienware M15x , Dell XPS 17 which one should I get?

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