Also you have to bear in mind the changing times. Technological progress was huge between 1939 and 1945.
The type VII may have been the best all-rounder by the turn of 1940, but was more or less obsolete by 1943
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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