Scrivener vs. Atticus

I write in Scrivener and have used Atticus to format. But I heard @Thomas Umstattd Jr. suggest in his recent podcast about Time-Saving Tools for Authors that Atticus could replace Scrivener in the writing process.

So do any of you write in Atticus? Have you chosen Atticus over Scrivener, having used both? If so, what advatnages have you seen? Thank you!