Here is why people prefer iOS devices over the Android counterparts:  http://theunderstatement.com/post/11982112928/android-orphans-visualizing-a-sad-history-of-support

Support.  Plain and simple.  I went through this decision making process when I opted for an iPad.  While I wanted the price of Android, and the openness of the platform, I felt having a device that would "just work" was worth the extra cost.  The above article, and attached graph, clearly shows how Apple shares that philosophy.