List of submarines by upgraded maximum stats

Advantages and disadvantages:
 * Submarines can only be attacked at by destroyers, light cruisers, torpedo cruisers, and light aircraft carriers. In addition, they are prioritized to attack submarines first, meaning your other ships get away with no damage for free.
 * Submarines are also the most resource-efficient class in the game, they cost almost nothing to deploy, and in addition the two or three expeditions you can send them on are very cheap because of this.
 * If you have Type A Ko-hyoteki, you can put it on a submarine for extra attack before the shelling phase.  After you get a submarine to level 10, they'll have that initial attack without any equipment at all. You can replace the equipment with regular torpedoes or turbine to increase their low evasion.
 * Once you level them up a bit you can take them to 2-3 and leave the stage as soon as you hit a fuel node.  Easy fuel.

Highlight note:
 * Green: Outstanding
 * Yellow: Above average