Which is better OpenHab or home assistant?

Recommendation: Home Assistant vs OpenHab What Is Best At the end of the day, it's an individual choice, you can either choose the no-fuss and easy to integrate UI that comes with Home Assistant or lean towards the more flexible style of coding backed by more advanced goals in the case of OpenHab. Sep 7, 2021

Where does home assistant store devices?

Home Assistant keeps your data local, no need for a cloud. Home Assistant communicates with your devices locally, and will fallback to pulling in data from the cloud if there is no other option. No data is stored in the cloud, and everything is processed locally.