Android browser is not secure enough because still cent percent users are using Jelly Bean 4.x in that is easy to hack and may easily decode and find keyboard inputs. Moreover, Apps from unknown developer can easily purchase in Play store that is also insecure for the device.
Waiting for the software updates can be a disadvantage of Android as Nexus or Google Play edition handset.
Including iCloud, iTunes and App Store, iOS has all Google Features as Gmail, Maps, Hangout, and Drive etc.
Apple App Store is secure, it also allows its users to restrict information Apps if someone wishes.
iOS has immediate backup and restore facilities. Using iCloud it is easy to install backup.
Use multiple email accounts by Sink up are the popular feature of iOS.
The recent update of iOS (iOS 8.2) is able to hook up with the Apple watch.
Disadvantages of iOS
iOS has limited users for its high cost.
Multitasking is not allowed in iOS since it has no widgets.
Battery life is too short and you will not be able to increase the internal memory if you are using a previous model.
The recent version for both the operating systems is Android 5.0 Lollipop and iOS 8 while, the iOS 8 reserves the smartest design for its multitasking keyboard, widgets and notifications. What is more, the most noticeable feature of iOS 8 is the gesture for navigation. On the other hand, Android 5.0 Lollipop has significantly redesigned and that is the revolutionary work of Google.