Never a Vaio, seen the state of gfx driver support. Want the best performance for money - meaning MSI, Asus for instance.
I own a Sony Vaio, and for the last two years Linux Drivers where not stable. But it has changed. Still the Drivers are proprietary, but that`s only a concern for purists.
Drivers on Windows work very (!) well, except for the webcam on Windows 8.
I like the Sony better than my 1st gen MacBook Air: there is a huge performance benefit, bigger harddrive and built in optical drive. So if you don`t rely on Mac OS and don`t need something very light, there is really no reason to prefer the Air.