So, the comparison is between the world as we perceive it - contains both free will and conflict - and a hypothetical world without free will or conflict. And the question is, how can the second be considered better for us than the first? Ignoring Stile's argument that we can have a world with SOME free will and no conflict, I think it might be a matter of opinion. Clearly, a lack of conflict is a substantial benefit. A lack of free will? It's hard to imagine how that would "feel". Would we be aware of the absense? If not, I think I might vote for the hypothetical paradise, at least for myself. On the other hand, if I had to make that decision for someone else, like my kids, it somehow seems different, like free will is to high a price to pay for peace.
If we were aware of it, would we feel bad about not having it? In a world with no conflict, would we be able to feel bad?
I don't think it's a slam dunk in either direction.