-iOS doesn't crash as often as Android
-iOS doesn't have nearly as many security/privacy issues/virus/spyware
-iOS is not(as) fragmented like Android
-iOS is faster (no lags) and not as buggy as Android
-iOS developer and user support way better than Android
-iOS ecosystem/app market way better than Android
-iOS user interface is simpler/easier to use/more straightforward than Android/TouchWiz/HTCSense/etc.
-more well-designed, well-written iOS apps than Android
-better battery life, better hardware, better screen, better user interface, etc.