Well, some point not mentioned yet
IPads tested for electromatic disturbance are allowed to be used in GA.
No iPad we use in the squadron ever failed.
You might think, its a minor point- but if Ann Android tablet makes trouble in the Air you might rethink...
Also, to the mentioned points about support/ development of Apps you get accessories like holder an so on for ipads, even from the manufactur of the bird - Not for Android tablets, which tells you also a story about what is prefered...