well, i think that is something that will never know, i liked more the german subs, but thank god, that the allys win the war, i think if germany has more time and resource to the xxi develop, i think that balao or gato class will be appear a toys against the xxi type and the atlantic war could finish in diferent way, and it's true the aws sistems of the us subs make the diference, like the german torpedo (g7e i think the name is) acoustic homing head (great for blow some nasty destroyers in attack run in sh3
), but if we can make sub vs sub, i think that us subs wins, not becouse are better subs, i think that could won becouse the aws and computer solution system, a german sub dosent had chance.
But like a sub, i prefer the german, becouse had bether hulls, and are pretty :P, anyway , i want a sh5 with soviet subs!, that would be awsome :P