Filling dialogue box once opened, the user can fill in the form in any order, whereas they must follow the menu hierarchy strictly. The form shows all the options at once and leaves them in view, whereas pulldown menus are only visible once opened, and once an option is set it is hidden again. Because of the free order, there must be a special "do it" key in the form, whereas selecting a terminal item on a menu automatically signals completion of the sequence. The error potential is the same: probably no invalid selections will be possible. Feedback is probably the same.