I find iOS to be superior. Many people correctly point out that Android lets you do many things that aren't readily accessible in iOS but when it comes right down to it, the refinement of the user experience on an iPhone for things you do all the time is better and you quickly realize that the esoteric things you could do on Android aren't that important. A small example is the responsiveness of the software to touch screen input when moving around on a web page or other content. The software's reaction to your finger's movement is instant on an IPhone 5 and slightly laggy on the latest Nexus. Stuff like that makes a difference for mobile devices that first and foremost needs to be quick and intuitive for things you do all the time.