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.