DELL the best warranty.
I bought the extend warranty and it is very worth for me. My laptop already replaced 2 or 3 times with new motherboard, they even come to your house to repair.

And their Facebook staff are awesome, they will reply you and help you diagnosis until your problems are solve. If they can't solve your problem on phone, only they will send technician to your house.

They change my whole motherboard mostly is video card problem.

But now I looking for other brand gaming laptop which suitable for light gaming.