I've been an Android user for several years. I have also written Android apps. About 9 months ago, I decided to switch to iOS in order to learn how to do iPhone development.
You might be wondering what I think of iOS after switching. Ok, you probably weren't wondering, but I'm going to tell you anyway. I think it doesn't really matter very much. There are huge differences when it comes to developing for Android or iOS, but when it comes to usage, not so much.
Sure, there are differences between the OSs. Each has a few features that the other doesn't have. But how do they impact my life? Pretty much all of the apps I personally care about are on both platforms. There's a huge difference between having a modern smartphone and not having one. However, I think the choice of which one to have isn't really that significant.