TBs excel at killing Subs and smaller ships, in which a DB will have more difficulty hitting. They are also great to use once an enemy is bulgeless. (IE late game, after the Kita's and subs maul through the enemy bbs.)
They are also good to use when there is plenty of AA in the air, as they don't need to fly high to attack.
Both have uses, but... if you start splitting up your precious space between both types.. you can land into a bit of trouble.
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