The ASUS is LoJack'ed :P
Basically you need to do this:
Pick out each of the things you particularly like about each one, then put a value (what you would pay for that feature alone) on each point, whichever comes out with the higher value... wins!
If I were in your shoes I'd go for the Asus,
1) bigger screen for gaming, (although the 15.6 is a really good size :P)
2) it will last longer