What are you doing with Markdown? My own requirements for a format are:
* 30 year viability.
* simple but explicit formatting: I need to specify font size, underline, and red text.
* clarity in writing is almost as important as clarity in reading, so I am not fond of formatting directives mixed in with text.
That led me to RTF, since Markdown fails on the second and third point, and LaTeX fails on the last. But you have to determine your own requirements from your use case.
* 30 year viability. * simple but explicit formatting: I need to specify font size, underline, and red text. * clarity in writing is almost as important as clarity in reading, so I am not fond of formatting directives mixed in with text.
That led me to RTF, since Markdown fails on the second and third point, and LaTeX fails on the last. But you have to determine your own requirements from your use case.