openHABian is a “a fully working Linux system with all recommended packages and openHAB recommendations”
(source: http://docs.openhab.org/installation/openhabian.html)
It has it’s own discussion thread here: openHABian hassle-free openHAB Setup
It has been created by @ThomDietrich in order to make it simpler for people who want to run openHAB on single-board computers (like the Raspberry Pi) but don’t have experience on how to manage and configure a Linux operating system.
Since openHABian is Linux based (not another OS), there should be no problems with this solution. You can add stuff to openHABian as you would do if you were running the vanilla version of Raspbian. Configuring your individual solution can be a challenge but this is independent of openHAB and/or openHABian.
In most of the cases, the solution is found in the documentation. This is being constantly improved and it depends also on community contributions to the content of the docs.
My recommendation is to invest some time to learn the basic linux stuff and if you get stuck with a problem, ask questions in the openHABian thread.