You should definitely update. There are many new features. Also, the firmware is now unified, meaning the OSPi, OSBo, and original OS all use the same code making new updates easier and available for all types at the same time. To update follow this tutorial:
In order to connect to your raspberry pi you’ll need to use Putty (windows) or Terminal (osx).
These are the official instructions if you need more info:
https://opensprinkler.com/forums/topic/announcing-opensprinkler-unified-firmware-2-1-4/