When asked, my iPhone-using friends only ever mention two "features" - build quality, and the ecosystem (i.e. the fact that apps work together seamlessly), and it's the second that really matters to them. Neither of those need to be any issue at all - assuming Apple wanted to come over to the light side.
The OS "experience" is obviously weak compared to equivalent Android and Windows devices.
The appstore has a larger selection than the Play Store, but that won't last, and in any case Google's store is already large enough to support anything you're likely to need.