There is absolutely no reason to use Windows Vista when given the choice, when Windows 7 exists... That basically sums of this whole topic.
Well, Vista is the most recent MS OS I'd use on a laptop/desktop*. After it goes EOL, I'd go with some Linux distro like Elementary OS. Or I could even buy an iMac or something on OS X.
*On a smartphone I like the latest Windows Phone 8 edition, I even prefer Windows Phone to Android. But I'd never use another MS OS on a laptop again. I'd rather learn Linux or even OS X than use Win 7 or 8. Windows 98 and Vista are still my favorite Microsoft OS versions, followed by XP and 2000. But they don't make them like they used to so I have to migrate to a different OS. OS X hasn't changed UI-wise as much as Windows since 2001, its development is evolutionary, while Microsoft tries too hard to recreate everything from scratch with every new Windows version. I don't like that at all, and XP and Vista are the only different-than-what-was-before looking Windows versions I like. Linux distros are also more consistent in their development and there's a distro for every taste. Instead of putting up with every new Windows version being way different than the former, I'd rather migrate to a different OS altogether.