In the world of smartphone operating systems, the biggest competitors are android and ios: the operating system for the iphone. The biggest difference between the two is simplicity. ios was made to be really simple, in fact the iphone and ipod only have one button. Ios does not allow the user to change much on the device. With the iphone or any other ios device, what you see is what you get. Theres not much tweaking you can do. However, android is open source, which means that you can find and customize almost anything on your android device including increasing your phones performance.