I think the key there is display. The value of not having to switch software ecosystems is high imho. Basically once both isa's can operate for 8 hours or so on a single charge I suspect the less functional one will need a much bigger jump in hours per charge to make up for the functionality loss.
I don't often go more than 8 hours without easy access to power. Once I can do that and run windows an android tablet would have to last a week or more per charge to make up for it.