Type VII is much harder for the enemy to detect, to visibly spot or to ping with sonar. I have managed to crash dive when spotting a destroyer who has yet to detect me and quietly move out of his path without him ever knowing I was there. With a type IX I almost always have to play cat and mouse with him for an hour.
Plus it turns faster and it's easier to keep enemies aft of your boat and you don't have to worry about them constantly relocating you with sonar while you wallow about in a big clumsy boat.
Dives faster too.
Not worried about the torpedo load out as I can just go grab more and my boat is usually ready to go sooner anyway so even though your kills are spread upon seperate patrols your can still keep up with a type IX on a total kill basis, and you don't waste precious time traveling thousands of kilometers where there are plently of ships within a type VII's range to be found.
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