The wisdom that was passed to me was that turning one way was better for steering, turning the other was better for performance. Cant say tat I've really noted a difference either way. If modeling a real ship, copy that.
The Titanic, like most liners, was intended for running fast and straight - the rudder was more of a trim tab. Serious steering would have been done with differential engine speeds, and changing the speed of a huge great reciprocating engine going flat out was not an instant operation. Even today, 50-odd thousand tons doing 20Kt takes a lot of persuading to go in a new direction.