The big advantage to the magnetic is that you can send one under the keel at pretty much any angle. The under-the-keel shots deliver more destructive power than impact torps.
But, magnetic torps have a problem with rough weather, and seem more prone to premature detonation.
My preference, to destroy a ship under ideal conditions, would be magnetic triggers.
If I wanted to merely get a torpedo hit, I would choose impact under ideal conditions.
Under less-than ideal conditions, I would choose magnetic to get a hit, unless there's heavy waves, then my preference goes back to impact.
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