Retina MacBook Air vs. Retina MacBook Pro

As we all know, WWDC 2012 is approaching, and approaching quickly. In two weeks, we will all find out what many of us have been waiting for. New MacBooks!!! The rumored Retina displays are exciting for almost everyone, since most of the MacBooks have pitiful screen resolutions. My question is whether the Retina MacBook Pro or Retina MacBook Air is a better by. Which one has the best blend of portability, power, function, and value? What features will make you choose one or the other. Share your comments!