For the most part, people use the one they happen to have.
But usually it works better to buff up a unit's strong stat instead of trying to patch a weak one.
You really should be running someone with high res next to the BK
Also, there's the option of special fighter (though the skill is rare).
If you buff up BK's rather well off speed, he can blast off specials and avoid their opponents specials. Without needing a breath skill in A or a heavy blade in seal.
Overall though, just pick the breath you happen to have/can miss more.
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