Yes, Craft's Prototype is nice. Most important for me is that it works in Sketch, and I don't need to export anything. It is the most frustrating part when you work with Flinto or Framer. The interface is pretty intuitive, but it lacks visual representation of event connection. I think it will be hard to maintain bigger projects as you don't see what buttons are clickable and where they lead to. But I think Invision team will fix it in the future.

I liked fixed header/footer feature, works perfectly.

The only thing when you want to share a prototype, there is no way to do it. You should use your phone to make a live demo like in good old days.