If you're going for maximum stealth then you should have as little railing as possible. The French La Fayette and Singaporean Formidable classes of stealthy frigates have very little railing.
take in mind that these have 'covered decks' and 'extended bulwarks' instead of railings. these take more mass and add additional parts without that much additional stealth. for maximum stealth, you need to take railing away as much as possible indeed. for making a ship actually work well (something french designs aren't always that good in) it is not an good idea.
see that the dutch and british stealthy designs actually have railings, while the the american zumwalt seems to have taken away the need for people on it's decks by other means.