I have tried a number of methods and workflows. The one that works best for me is Sublime Text and markdown with Marked 2 (http://marked2app.com/) setup as a build system in ST for previewing the markdown and exporting/printing the markdown file in a number of formats, eg. PDF, HTML, DOCX. I use DropBox for note portability and then I use ByWord (https://bywordapp.com/) on my iOS devices for editing and previewing.