I'm reading about torpedoes as well and much to my surprise, the Italians may have had the best torpedoes of the war, or at least superior to the German and American ones. I don't know about the British or Japanes ones.
The Germans apparently preferred using Italian torpedoes for aerial drops and the Americans studied the Italian torpedo design to improve theirs.
I think the Japs had good torpedos.
Anyone know anything about the British torpedos (besides the fact that when compared to the Italian ones, it was like a comparison of their crotch sausages - smaller but somehow still able to get the job done).
Picture of 2nd Lieutenant Dalmazio Corradini illustrating the supremacy of Italian torpedoes vis a vis the British. 