Originally Posted by tenuous
IMHO, the US ss5 is the best sub... hands down. 6 forward tubes and 4 rear.
It's the best sub IF there isn't a KM SS5 playing ASW.
Originally Posted by OP
Words
The best sub nation is which ever nation you have a BB crew for. Over leveled engineers are worth their weight in palladium.
If you don't have any engineers and this would be your first line;
IJN, UK or SN if you want to attack BBs and CVs.
USN or MN if you want to do everything.
KM if you want to attack other subs.