I have been using OH2 for quite a few months now. Earlier my setup was on Pi-3b+ with raspbain, however lately I have shifted to a software named Diet-Pi. Diet-Pi is the most lightweight software for SBCs i.e. very light on resources( which are very limited on SBCs) and runs on many other SBCs besides Raspberry Pi as well. Please checkout their page for more details.
The thing I want to talk about is that Diet-Pi adds optimized softwares to their OS and those optimized softwares can be very easily installed by selecting from the menu. They have already added HomeAssistant to their list and there is voting going on for adding other softwares as well. Openhab has about 7 votes till now whereas Domoticz is leading by 50.
So I request you all to vote for OH2.
Here is the link
Update: Openhab on 28, Some Other leading with 56 votes.
We Need a lot more votes