I wanted to write what would it take for you to switch from IOS/Android to Android/IOS but it wouldn't fit.
To be honest two things would have to happen. Google would have to completely remove the open and customizable nature of Android and Apple would have to put in a game changing feature into their OS. Something like Star Trek level voice controls. If Siri worked like EDI from Mass Effect 2 were you can ask it a normal question and it respond like an actual person I would jump ship.