Then go for D'Art. Since you have good team and weapon she could use. At the very least you won't be able to complain "If only I ad D'Art then I would get better/more drop!". Plus she have nice debuff to atk/def.
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BUT I don't want to choose a soul. I want them ALL
if you buy couple points every event you will end up with all souls. If your team is strong enough during advent events to do ragnarok without elixiers and farm the highest possible difficulty for mats, you end up with a lot of unused materials, while farming to mlb weapon/eidelon.