I have read whatever I could find online about W1 (junior) professorship in Germany, and to me it seems it is somewhat close to a full time lecturer and the tenure possibilities are slim if none, all the more slimmer at the same university. However, the person who has invited me for an interview said this is rather because they are legally required to do so, but there are tenure possibilities. I will ask him for more information, but 1. I do have a tenure option at other university (and another country), however the university is not at all in a good ranking, I also have an invitation from a couple of really good universities but I will need to decide soon so I don't know if I will be able to act upon those.
First things first, I don't want to be a lecturer - meaning that I don't want to focus on coursework but research, I heard that junior professors can have students and a research group? But they also teach a lot of entry level courses? so what are these "tenure possibilities" exactly? Does he mean a remote possibility in 6 years? Or does he mean somewhat something close to a tenure-track? What are tenure chances?