What I would prefer is cellular connectivity in an iPad. Throw it in the backpack to use when I want a screen, but use watch/wireless headphones while walking around, or talking on the phone.
All of the current iPads comes with cellular connectivity as an option. However, unlike Android devices they can't be used to make phone calls.
I know it sounds a bit gimmicky (like using an iPad as a camera), but my father in law has a Galaxy Tab which is what he uses as a phone/tablet/computer. He just carries it wherever he goes.
