IXB is my favorite.
It's not the torpedo quantity, as I don't carry external reloads. Internaly, I only carry 2 more than a VII, and they're both in the stern.
IX(A) is next. Again, it's not the torpedo quantity, as I carry the same as a VIIB does internaly.
Pluses:
More stable platform (surfaced and submerged).
More oxygen.
Higher surface speed.
Double hulled.
Longer range.
105 mm deck gun.
More damage control slots.
2 stern tubes.
Good convoy attack boat.
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