I have the iPadMini2 for my Mavic, and IpadAir2 for my P4. I like both of them, however the Mini2 will overheat in temps higher than 90F sometimes. Friends like looking over my shoulder when I fly, so the larger iPad
Air2 screen helps out.
I use IOS because it simply works best, I think better than Android, and I like Android. My phone is an LG-G5, love that phone. When I spoke to a DJI engineer at NAB last month, he admitted the IOS team does a better job than the Android s/w team for the Go apps. But in defense of the Android team, they have a tougher job to get their s/w to run on so many different platforms, from many different manufacturers, using different h/w architectures. Apple locks things down more, so it's easier to create apps that are stable. Even the
P4P+ android app that doesn't allow third party apps will lock up, forcing you to reboot the android display, mid flight. I've never had Pilot, Go or Go4 apps lock up an IOS device. They just work.
The only thing I wish for is a brighter screen, and iPad's are pretty bright in comparison to other tablets. I use a
Hi-Aerial hood when it's too bright out, and when I really want to see good, I use a 30" brock-umbrella on my head. I love looking like a dork.....

..... but hey, it works, when I'm not in wind.