I use both magnetic and impact triggers, but I use them depending on the situation.
In bad weather, rough seas, I rarely set the torpedoes to magnetic trigger. I've had enough detonate prematurely that I now avoid it. Except when I'm really close to the target, between 500 and 800 metres, maybe. Then I sometimes run the risk of a premature detonation.
In good weather, I tend to use magnetics a lot, especially when I can't get a good angle on the target. Magnetics work better the longer they spent under the keel, so shooting them at a greater or smaller angle than 90 degrees works well because it takes them more time to travel underneath the target. I almost always set the running depth to a metre below the targets draught. This tends to work very well for me.
So bad weather: impact. Good weather and/or bad angle: magnetic.
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On sailor's grave there are no roses,
On a seaman's grave there blooms no Edelweiss.
The only ornaments are the white gulls
And the many tears a girl is weeping.
-- German folk song, sung by German seamen during the war.
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