so SECURITYwise, xibo 1.8.11 with docker is a better choice over 1.7.10?
Absolutely yes.
Docker gives you a level of isolation between the application and the machine it is hosted on, and also between other applications you might be running on that host machine in their own containers.
We have a whole blog post about the reasons 1.8 is superior, and what Docker brings to the table in that regard. You can find it here: