Blocking the scene with the actors is the most important part of preparing to shoot a scene. The director decides what are the best camera moves to tell the story and convey to the audience what the actors are thinking and how they progress the story through the action.
The meaning can change with different blocking both for the actors and through the camera movements and angles chosen by the director and DP.
The video below shows different set-ups from the same script and how each set-up changes the feeling of the script. No one version is better, it comes down to the directors preference and the way in which he or she chooses to tell the story.