As has been said the Mk14's are better on paper but in practice were awful & even directly contributed to lives being lost on "our" side. By late 1943 they were finally squared away & proved reliable. Ironically about the time they got the Mk14's working the Mk18's were in service & had many of the same problems but because they generated no wake were more warmly received. I recently read somewhere that 40% of the ships sank by the American subforce was with Mk18's IIRC.
BTW in regards to your signature you English is far superior to my French so my hats off to ya!
