As GrahamBy write, they tell two different stories (at least for me).
The uncropped version seems more joyful to me because it conveys the feeling of the photographer watching the boy playing and, therefore, it implies that the boy isn't play "in a void".
The cropped version is more disquieting because give the sense of this boy playing alone and makes me ask if this boys play alone often, if he has friends to play with and so on.
The low key of the cropped version, too, doesn't help the lift the mood (while in the uncropped version the archway's frame lights up the key).