Google Nexus Phones : Why They're Different ?

For starters, they are free from user interface customisations that manufacturers pre-install on device(for instance, Samsung's Touchwiz, Sony Ericsson's Timescape, HTC's Sense and Motorola's MotoBlur). Nexus phones do not have 'boltware' - trial/limited versions or apps that you didn't ask for. For people who like a clean, fresh slate, a Nexus phone offers the stock Android look and feel with only most basic pre-installed apps. Finally, Nexus phones always get Android updates first - since there are no changes to be done to the interface, new versions of Android can be delivered much faster. Plus in some cases manufacturers may not even update low priority devices to the newer versions of Android.