EDIT: the Samsung 15" only has on board graphics, so that one is out. Between the 14" Samsung and the Acer, the Acer has more Ram and a bigger screen. Your choice, but I'd go with the Acer.
thx bro , really appreciate the fast reply and answer
is there a hidden catch ? Acer not pricey as the Samsung . and i got another deal for the Samsung 14" Samsung deal