Mini and Air - the choice is actually pretty clear
At least from my experience, the 9.7 inch display on the Air provides a far more immersive experience than the 7.9 inch display on the mini. To sit back and enjoy your content. And also really focus on completing stuff. The entire ecosystem feels more at home and perfectly optimised for the 9.7 inch real estate as well.
That said, if you are going to carry around your iPad outside most of the time, iPad mini is clearly a better product for you. So it simply depends on where you mainly use your iPad.
So, what do you think? Do u think there are other considerations?