I use acrobat reader at work - as Okular can't be installed that easily on
windows if you don't have admin rights ;-)
But I find Okular far superior to adobe's product, mostly in the UI
department. Acrobat is just horrible, while Okular has 95% of the features
yet a clean and efficient interface. Just try using your mouse to scroll
through a page - when you hit the bottom of the page, things stop in
Acrobat. Okular just goes on, you won't even notice such features but they
matter once you have to go back to Acrobat.