With IT, you have to follow the 1960s mainframe purchasing advice, which remains true today:
Find the application software which does what you want, and
then find the hardware that runs it.
Nowadays, everybody is doing it the other way round. They buy an Iphone or an Ipad, and then they tear their hair out when they find it does 75% of what they need.
The Ipad is a superb PDF reader, but not a lot else (for European aviation, currently).
My view, having spent way too much time playing with gadgets for aviation, is that the IT requirement works best when split between ground and air.
For ground stuff you just want a nice slick lightweight laptop, and everybody and their dog makes those, from £300 for the cheap ones to close to £2000 for the really slick ones. It will come with windoze so it will run everything needed, straight out of the box.
For airborne stuff, what do you really want? A good VFR GPS, running the "printed" CAA chart, is highly desirable. But you don't need a lot else, because you have basically pre-planned the trip before departure.
For IFR pilots, there is a utility in displaying approach plates etc but what if this device packs up? Any electronic device can fail. This leads to the inescapable conclusion that one
either needs to have the main stuff pre-printed (and rely on some electronic device, loaded up with loads of plates, for emergency / unplanned diversions, and this is what I do, basically),
or one is a bit reckless, IMHO. Or one can backup the electronic device, with a second one
