I use Scrivener. And though you can do many of the things that you can do with Articy:Draft with Scrivener, there is a difference in focus. Similar tasks, but different ends. And as such, there is a distinct difference in the execution, purpose, and focus of the software. That is the reason that I, in the end, didn't stay with it when I trialed it, but rather continued to use Scrivener. I am not doing a good job of explaining the difference- it's a bit in the use, I'm afraid, rather than what I can put into words. Which is the reason I was glad that I had a trial. I don't think that anyone would have been able to tell me whether one or the other was for me- but it became obvious quite quickly in use.
Did you watch the feature videos?