I can't seem to find a write-up on what is different between these two choices? If i have this: Can I or should I install 1.14?
You could look at the "Whats new in osTicket version 1.14" https://osticket.com/blog/2019/09/19/whats-new-in-osticket-version-1-14/
1.12.x is the old version. It is currently only receiving security / maintenance updates. 1.14.x is the current version. It is getting bug fixes, security / maintenance updates and is the base for the next version for when it is released.
Yes, you should upgrade.
