The ASUS Zenbook is much better value for your dollar, that's why.
ASUS Zenbook Prime UX31A-DB51
vs.
13.3" Samsung Series 9 and
15.6" Samsung Series 9
If I had a choice, I would've went with the Samsung too since I think it's one of the most beautiful laptops on the market, but the aesthetics does not justify an extra $250 of my pocket's money. That extra money could be spent on a nice case and external hard drive instead since the hardware is essentially the same.. The ASUS also has the bonus of a nicer screen and a standard US keyboard. It does lose in the battery department with 6 hours vs. 7 though.