Apple

I think it still comes down to user experience. A phone's OS is not supposed to get in the way of you using it. It's been a while since I've had an android phone, but for instance I remember when an app crashed it would give a dump of the technical details. People don't want to see what's going on under the hood. They either want it to just work, or to completely exit and then try again. Android is still a "tinkerer's phone." Even I, a computer programmer, want a phone that lets me do what I want to do, with a phone that is designed around a refined, intuitive, high-quality OS.