You might think app design is app design, whether the software is being developed for iOS or Android. But, in fact, creating highly polished, elegant-looking apps is simply easier to do when developing for iOS. That's the prevailing conventional wisdom among developers who code for both platforms. Hipmunk UI/UX designer and iOS developer Danilo Campos explains it succinctly: "The very simple short answer is it's easier to make a good-looking, attractive iOS app compared to making an Android app."
Design is built into Apple's DNA. Google's legacy, on the other hand, is search. So it's not too difficult to guess which platform places a higher premium on app U.I. and aesthetics - and which platform makes it easier to create beautiful software.
The article goes on to say that Apple's SDK developers tools have had 20 years of refinement, and that Android's fragmentation means that it is harder for developers to create a smooth, sophisticated app for Android. Android is working to catch up, but it will take a lot of time.