Hmm let me say this and it might asnwer to your question. The only way UK to survive during german threat was convoy coming from america or from other countries. So the more merchant ship you sink, the weaker UK is...... so sinking dd wont help the german winning the war but sinking the merchant convoy for UK.........
And in game simulation i would recomment merchant too since they are slow, their tonnage is more important than a simple DD with 1k of tons. While DD is too risky and you might bring the end to your crew and sub
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