I realize that it's usually better to just learn / use hiragana but I have been asked to look into coding up a solution to convert from Hiragana/Katakana to the modified Hepburn Romaji.
One point I would like some advice on is the conversion of:
I see some converters changing this to:
and others to:
Is there one or the other that I should aim for with the Modified Hepburn?