Even though everybody probably likes Messi and Ronaldo, i would pick Ozil. Love players who know how to pass.
Of course everybody's natural reaction to who the best football player of 2012 would be would be Lionel Messi, since he's the most wanted and desired player in the world... Any team would love to have him and would benefit greatly from having it, not only by winning trophies but from the marketing value he possesses.