Whichever you feel most comfortable. Sometimes I started with IIA then IID, VIIB, VIIC, IXB, IXC, IXC/40, so on. In 44-45, I mostly prefer to have VIIC/41, 42, and XXI over any other boat cuz they dive deeper and quicker which is most important to me. I don't mind not getting much renown at those late years if I'm using VIIC/41,42 compare to IX varients cuz I always have enough renown to afford whatever I want. For early war year, I like VIIC cuz convoy isn't as interesting until 41 or after that makes me wish I had IXC cuz of how many juicy targets are involved.
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