This point has been discussed extensively in this forum. It’s not productive to re-hash all the excellent points that have been cogently made. In short, the routing and repair algorithms are superior in Plus, additional command protocols make communication more reliable, and make your mesh more resilient.
https://docs.hubitat.com/index.php?title=How_to_Install_Custom_Apps
https://docs.hubitat.com/index.php?title=How_to_Install_Custom_Drivers
You can also use Hubitat Package Manager, an excellent user-contributed app by Dominick Meglio (@dman2306), to install and manage updates to your user-contributed code: