As I posted here, I lost all of my book content in Ulysses. Ulysses is a great app and I’m sure my experience is an outlier, but I don’t trust Ulysses at this point. I moved my complex writing to Scrivener and all other writing to Pages.
Again, I want to emphasize that Ulysses is a great app with great developers. I am not throwing Ulysses under the proverbial bus, but, when an entire book project disappears and can’t be recovered by Ulysses, one losses confidence in the app.