The main reasons I stay on iOS
1) Vender lockdown & habits - I've been using an since the second iPod Touch (as a PDA). I'm not ready/eager to change "my workflow".
2) Accessibility - iOS (and the mac os) has had some the best (or at least easiest to setup) accessibility support. I'd be happy to be wrong about this but Androids documentation is either really lacking on these features or the features aren't there.