I like both boats, but think the differences between VIIb and VIIc are trivial. If you start your career with a II, go to a VIIc instead of a VIIb. If you start your career with a VIIb, try to survive until the VIIc/41 comes available. It's the same as a normal VIIc, but can safely dive to 300 meters (undamaged boat), a depth you'll need from the end of 1942.
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