I've tried Drafts (and pretty much every other app that supports Dropbox sync) and none felt as intuitive as Notebooks[1]. There is even a free iPhone version[2] you can try. Has support for Markdown and Webdav as well!

[1] https://itunes.apple.com/nl/app/notebooks-write-and-organize...

[2] https://itunes.apple.com/nl/app/notebooks-for-iphone/id78044...