A lot depends on your playing style. Those two light cruiser deck guns on the
Narwhal class are rather unique even for US subs. Great against not too heavily armed targets. Wonderful for shooting up harbors too. However, they are slooow divers and not too maneuverable underwater. I wouldn't want to go up against a heavy escort while submerged in a
Narwhal.
The
Gato would be the quicker, deeper diver and more nimble underwater. More tubes, more torpedoes. Nice AA armament topside too although I'd use it more on sampans than planes. Probably the better boat to have later in the war.
Sounds like the kind of decision that could be put off for a while you think about it if it's still early in the war.
