If there is no best possible world, then for any world God picked to actualize, God could have picked a better one. But if God could have picked a better one, then it seems that God could have performed a better action. And if God could have performed a better action, then God could have been better. But how can God be better if God is essentially unsurpassable (a.k.a. "the greatest conceivable being"). This is a serious challenge to theism, and in this video Dr. Kraay offers five responses to this argument.
To read more about this topic, check out Dr. Kraay's paper linked below. https://people.ryerson.ca/kraay/Documents/2010Companion.pdf
To see Dr. Kraay's defense of the view that there is a best possible world, and it is a multiverse, check out my interview linked below. https://www.youtube.com/watch?v=kyXDlyI0Swg&t=276s
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