Android latest version tends to offer better security, performance and addition of new features, such as increased level of privacy controls, as well as smooth UI. It is normally advisable to update as it will assist in safeguarding your device against vulnerabilities and future compatibility with new applications. But, before updating, make sure your device is compatible and learn about bugs in user reviews or battery problems. Older phones will also take a little time to update but it is always advisable to save your data before proceeding with the installation.