I have a 6 and the iPad Mini 2. I use my Mini ALL the time. I specifically chose it because it's easy to toss in my purse and is barely noticeable. It never gets in my way. I spend a lot of time back and forth to the hospital as my father is chronically ill and I never leave home without it stocked with mags, books, movies etc. While the size of the 6 is great, for me it would be too small for hours on end like that and the Air would be too big in the same kind of situation. Heck, even without those circumstances I just prefer the Mini. I was watching a show my Tivo missed on it a few nights ago and my DD offered me her Air and I turned it down. So, it really just comes down to what will you be using it for?
edit: sorry this was in response to brookydoo. Should have quoted.
01-13-2015 10:47 AM