There are reasons to like iOS over Android and vice versa, but that boils down to personal preference and economics of one ecosystem over the other. When you cut out all the external factors and leave just the OS, the difference between the two is literally so minimal, I'd argue there is almost no difference. Sure, I can have a back button with one system, tap to the top of the screen with another, slightly different system setting menus, but if I handed someone a Nexus and an iOS, 99% could easily navigate both systems with success. I happen to own both systems and use both daily. Other than finding myself tapping a non-existant home button on the Nexus 5 ocassionally, they both function nearly identically. Take a look at how I have my Nexus 5 on Android 5.0 and iPhone 6 on iOS 8.1.1 set up. Nearly identical. If you'd like to add some pics to show similarities between apps on both OS's, please feel free.