Man, I love them all!
I've always had a weakness for the underdog. I was a Type II hugger in SH3 and naturally I lean towards the S-Boat a lot in Wolves of the Pacific.
The only thing I don't like about the S-Boat is the lack of a TDC (yeah, I know it has one in the game, but I like playing historically) so I switch to Porpoise every now and then when I'm tired of filling my map with doodles
