I really like the portability of the 4S iOS (have a 5S now)
I really like the large screen of my S4 android (work phone).
I keep thinking that it should be possible to have a compact portable phone... ala 4S (or smaller). But if/when I need a larger screen have something other than an ipad; just a display and battery for it that it would 'just link' to the phone(sort of like carplay, but for at home). Yea... I'm a crazy wabbit.