Custom Rom
The biggest advantage of Android is that it is an open-source project, that allows for many developers to join the community. The Android developer community is quite big, with their biggest feat being the ability to develop custom ROMs or custom Android builds. A custom ROM is an aftermarket firmware production based on the Android source code provided by Google. The main reason why people prefer custom ROMs is the fact that almost every company drops support for their devices after 2 years of their launch. A custom ROM, on the other hand, helps keep your device alive and updated with the latest in the world of Android. Another reason why people seek custom ROMs are the tons of features they offer, and that too without any bloatware that is part of manufacturer skins.
Mahesh 