You're asking this in a MacBook Pro forum. I assume most of us already have MBP's. I voted for an Air, simply because I already own a MBP and might as well have something different.
Pro for sure. Almost same size which contains more power and faster than air. If you're going to do what you do usually in day. Macbook air will be ok, however if you intend to some stuff such as photoshop, playing video game or Xcode etc. That option should be pro.
You are asking in the MacBook Pro forum. Go to the MacBook Air forum and ask and get a mirrored result.
I personally would get Pro because I need power, but on the other hand, I like the portability of the retina... Retina 13" is kinda best of both if you ask me.