PRrimarily 1) finger typing 2) thumb typing 3) viewing in both positions 4) portbability amd versaility. After 4 solid days of using the air, as much as i love the bigger screen on the air (it does give a whole new experience), the mini still wins cause nothing will beat it for comfort and portability. I find that if you use the air for a few hours, then go to the mini, you really do miss the extra screen real estate The thing with the air is that, even though its lighter than previous ipads, its still a big device. Compared to the mini, it feels huge. Holding the mini and typing on it cant be anymore comfortable. Whether its landscape or portrait, the weight is perfect. On the air, its more comfortable than previous ipads but at the end of the day, its still too big. Thumb typing>finger typing. This is why the mini was such a relief cause you could type on it just like you would with your phone. Cause really who the the hell finger types on their phones? Unless you have big hands to thumb type on the air in landscape, your hands will scretch and a major chore just to reach the centre, and it isnt exactly the best for the hands. My hands will cramp. So you split the keyboard, which even though ive gotten better with it after using it for a few days, it doesnt come close to the mini cause the keyboard size on the mini was perfect, whereas the keys on the air split Are sooooo tiny. You go from a keyboard thats too big, to one thats now too small. The keys are way too narrow IMO. I cant be the only one who thinks this? Apple should have put two adjistments levels for the split keyboard. Theres no happy medium. Wanna know something odd? I was comparing the two, the air when split, the keys are the exact same size on the mini split! WTF? They should be bigger. How does that make any sense. I can type so fast, whether thumb or finger, on the mini. Air, better than previous but once you add a case onto it, it still feels like a reg ipad. I typed so much on my mini over the past year because it was so comfortable and natural. Ipad air, still feels like a full size ipad, which felt like a chore to me when i had an ipad 2.