Look and feel are important to me when writing. Ulysses and iA Writer both do this well. But I must admit I like that Ulysses allows me to organize my writing, as well as write. Where iA Writer has to be used in tandem with Finder, Ulysses works on its own.
Scrivener has long been the tool that people recommend for writing long content on the Mac. We’re talking novel length work. But seeing as Scrivener is a bit odd in terms of UI and seems to be updated infrequently, I can see Ulysses challenging in this arena. Ulysses nails the Markdown experience and gives a very solid document management toolset as well.
Interesting non-review—according to Chris—of Ulysses. Seems there’s a healthy amount of apps in this space for everyone’s taste.