IXC all the way. It's by far the best platform for sinking ships due to the large range and number of torpedoes. To enjoy it though you have to enjoy long patrols in distant waters. Later in the war trying to attack an escorted convoy is a virtual death sentence but there are ways you can use your size and range to your advantage.
As far as IXB is concerned: Yes change it for a C Type as soon as possible as that way you will have all the latest upgrades.
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