1. Do you want to write something that MD is sufficient for? Write MD.
2. Do you want to write something that you need RST for?
2a. Is your document already in RST or is there no document? Write RST.
2b. Is your document in MD? Pandoc to RST. Pretty print. Write RST.
The reason this is useful is that the 90% use-case is probably hit by MD. You may never need RST. And you won't spend more time deciding and discussing than actually doing because this algorithm only takes a few seconds to execute.
1. Do you want to write something that MD is sufficient for? Write MD.
2. Do you want to write something that you need RST for?
2a. Is your document already in RST or is there no document? Write RST.
2b. Is your document in MD? Pandoc to RST. Pretty print. Write RST.
The reason this is useful is that the 90% use-case is probably hit by MD. You may never need RST. And you won't spend more time deciding and discussing than actually doing because this algorithm only takes a few seconds to execute.