I currently own the original iPad mini and need to upgrade because it is not sufficient anymore. It works, but can become terribly slow, crash under light loads and has the screen retention problem when the brightness is turned up. I use the iPad mini as my main personal computer when I'm not at my desk. My Macbook Pro (2010, also getting old) is only used at home for backups and for downloading media. As a PhD student, i have a Dell laptop at my desk which I use with cross-platform apps like Evernote and Google docs. The general use case for the iPad is when I'm at home (50%) for work and entertainment, when I'm travelling (25%) and during lectures (25%). Even though i love the small size of the mini, reading/annotating articles and writing texts is sometimes a pain because of the small screen. That is why i'm looking to upgrade to possibly a larger screen size. I'm also intrigued by the ability of the Apple Pencil to make notes, draw schemes and annotate pdf's. But i'm afraid the iPad pro may be to big (and a bit to expensive) for my use case. The upcoming iPad Air 3 may be interesting if it gets pencil support. Key question to you; what are your experiences with the three sizes? Which one would you choose in my situation and why?