Unfavorable, as there is a hallway in front of it. To be honest, we tend to open towards the shower because of the path to the sink. After all, the shower will never be used with the door open or half-open.
Except for the bathtub, which we also want to use sometime, you are right Yvonne. A stopper behind the door is probably advisable on both sides (there is a cabinet on the other side). We do not have to determine the direction of the stop itself - only whether it should be 50 cm or 40 cm from the wall farthest from the shower.
Stop against the wall (that is DIN right). Otherwise, you will always have the stopper standing in front of the shower door. Even when you go into the bathroom to wash your hands, you will probably always open the door almost completely - no matter which direction the stop is facing.