For a while now I've been hosting my own blog using the static site generator Hugo. I like it for its simplicity, I don't live having to maintain the software on my local machine.
I've used posthaven in the past, but it seems perpetually feature-lacking. I think Medium is ok, but I don't want someone else to own my blog.
I've been keeping an eye on Ghost for a while now. After installing it and playing around with it I decided it was good enough. The admin / UI is decent and the fact that it's FOSS is a deal-maker for me.