It real life the ob scope gives wider angle, greater elevation, greater magnification and binocular vision. Post war, and in some U-boats during the war, it was motorised. The draw back is the top end is big and therefore more easily spotted than the smaller head of the less capable attack scope.
The observation scope was sometimes called the search scope, because it was used to find targets. Once a target was located the skipper would shift to the attack scope.
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"Pitt was the greatest fool who ever lived to encourage a mode of war which they who commanded the seas did not want, and which, if successful, would deprive them of it." Earl St.Vincent (allegedly)
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