Type II is nice at the start of things, but as soon as the type VII is available im switching to bigger cans. The main reason being the luck of shipment along the east coast of Brittain.
Playing at 100 % reality the torpedo loadout is slightly insufficient for me, as You can see from the screen below the sinking rate improved when i switched to its bigger brother VIIB. I still like the look of type II, but for sinking purpose its just not up to the job in the later years.