LogFAQs > #901927697

I don't like that play method generally and have been doing well enough at avoiding it-- but assuming no Entrust does that advice tend to change or not? +30% damage seems like a lot to give up but getting soul breaks off a bit quicker matters.

Short answer: no.

Long answer: If you're getting some kind of utility out of your Soul Break, like the front row party quick cast of Marche USB, or if you're trying to squeak a SB cast before some arbitrary point, like getting off both both your En-Element and your AOSB before the Magicite timer reaches 30s, then it may be worth going for a +SB RM instead of a +Dmg RM. But the general rule remains, DPS characters should have either DPS RMs or (for some setups) Thunder God.

Should I use the 30% or 40% ones?

I think the rule of thumb here is "chases should take +40% chase damage, others should take +30% weapon damage" but I haven't run any serious numbers.

Functionally the damage output would be identical whether it was much more sword damage or much more Holy damage right?

If your Beatrix has no other sword or Holy buffs, then yes. In practice, +sword will be better than +holy, because it's much easier for Beatrix to get +holy damage (weapon, armor, magicite) than +sword damage (a pittance from her record dive). Going from Sword Damage x1.03 to Sword Damage x1.33 is a bigger deal than going from Holy Damage x1.2 to Holy Damage x1.5.
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I don't like this duchy. Now, it's an adventurer.