Some people have 2 cellphones so they can use the OS of both systems.
http://www.businessinsider.com/android-vs-iphone-features-2014-10?op=1
It seems to go back & forth as to which OS is the best.
http://www.uncoverdiscover.com/tech/10-reasons-android-beats-ios/reason1
Its been that way for years.
http://www.geeky-gadgets.com/android-vs-iphone
For some ios will always be the best.
http://www.dailydot.com/technology/iphone-features-android-doesnt-have