Why opt for iPad Air over Mini Retina?
Before this week there was a real reason to choose either the iPad or the iPad mini. You either wanted best screen, best chip, the most this and that; or you wanted a small kit.
I will be upgrading this cycle and would have chosen the full size device... But now, I seriously can't see the point.
The Retina Mini has the same chip, same storage, "better" same display, same camera, same everything and yet it is lighter and cheaper.
So unless you have trouble seeing and need the bigger unit, or have giant fingers that are going to fumble over controls on the mini...
Well.. seriously why would you pay more and have more heft for exactly the same thing?
iPad Air, iPad Mini Retina - same
(Currently have iPad2, will be keeping that)