Finish line ceramic. I may well be being ripped off but it seems to work ok and one little bottle lasts ages.
Before I switched to this I had a problem with stiff links. Now, there is probably no causal link between changing lube and the resolution of that problem, but my caveman brain has made the association so I'm going to keep using it.
I could probably just as well use old chip oil, but the scientificy advertising blurb keeps me happy.