What was the best submarine class of World War II?
Short answerThere was no universal best: Gato, U, Type VII, and T-class boats each matched different theaters and missions especially well.
NotesA long Pacific patrol favors a Gato-class boat, while the confined Mediterranean makes the smaller U class more attractive. The Type VII earns a case through the theater it served in, its longevity, adaptability, and results relative to its design. British T-class boats offered an unusually heavy torpedo battery suited to ambushing traffic in restricted channels. These contrasts show why endurance, size, upgrade capacity, weapon volume, and operating geography must be specified before naming a best submarine.