Today, the answer is a bit more complicated, Both platforms are in good and work well but as success of android phones is growing day by day. Android is an open source, free, Linux-based operating systemfor smartphones and tablets. The system was designed and developed by Android Inc. and the iPhone show you the time when you press the lock button. But many Android phones do time keeping better.
Our experience depends on uses and choices that most of the European & American clients get the iOS developed first. whereas Asian region clients get the Android developed first.