Best one is SAMSUNG, I have one for 3 years and no error or problems till now.
By the way SAMSUNG is producing ALL SCREENS of SONY, do not waste your $$$$
to buy damn SONY.
HP's graphic card sucks, I know 100+ people in my university sold their hp because of problem
ASUS has battery problem as I know
and SAMSUNG has only KEYBOARD problem as I know till know
SONY has some battery bugs and HIGH prize
my wife's brother has a company fixes laptops and he gave me his results