As far as the game is concerned, and not real life, Mark 23. Renown excluded. Eventually they are free after 1943.
AI does not look at the wakeless Mark 18 electric like a real human would with the steam Mark 14 or 23, to see it coming, and to direct the destroyers to your position.
Mark 14 fast is the plain Mark 23, except if you peek into the .sim file you will see it has less chances of failure over the Mark 14 even after June 1943. Plus there is no annoying adjusting the default slow to fast setting which 95% you would use anyways.
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