US fleet boats - best frontline sub of ww2?

[Schroeder]

Originally Posted by Gino

. So, the germans had to come up with the type XXI etc., which (astonishingly...) was a diesel electric, more luxurious, six tubes forward...Hmmm, which submarine had that also? Oh yeah the Porpoise class Fleetsubmarine built in 1934...

Last I checked the Porpoise had 4 front tubes and two rear.
You also forget to mention the automatic loading system of the XXI that could reload all 6 torpedoes within 5 minutes. The extreme speed it could go while being submerged, its maximum dive depth and it's agility. Now show me those features on a Porpoise.