I'd say the iPad Air would be better. I had an iPad 2 and 3 and I loved the size of the display. It was perfect since they were portable devices, but the screen was large enough to comfortably read web pages and PDF's on. When I was between buying laptop a year ago, I exclusively used my iPad 3 as my portable computer and I didn't have a problem. When I bought the first gen mini last year I thought it would enjoy the smaller size but I found that I barely used it. I just got an iPad Air and I'm loving the bigger screen again, and now that it's a lot lighter it's a lot easier and more enjoyable to use. If you're carrying a backpack, the larger footprint shouldn't be a size.