I'm not 100% on this, if someone could confirm it would be nice, but I would think they are the same, since buffs are multiplicative, and therefore commutative. So whether you buff the NP gain rate of arts cards or the NP gain rate of the servant it ends up the same.
All told if it does work this way then it would be recommended to buff arts performance rather than NP gain since arts buffs apply to damage as well.
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