This is an interesting question. I would say that the boy that would be most helpful is Simon. Let me give you a few reasons for this rationale.
First, Simon is the most spiritual boy. He has a good sense of what is right and wrong in an intuitive way. He is the Christ-like figure in the book and he even dies in a sense as a sacrifice. This spiritual quality is important, in my opinion, because in our world bankers and many other intelligent people have tried all sorts of things and we are still in great difficulty. Perhaps we should give the Simons of the world a shot. Also it would be great to inject some more morality into our banking system. Greed is not good.
Second, Simon is also courageous. He does not let fear get the best of him. For instance, he is unafraid of the beast and he even tells the boys that it might be a figment of their imagination. This is another important point, because our world operates out of fear too often.
Best guess is Ralph because he's very responsible.
Ralph is the athletic, charismatic protagonist of Lord of the Flies. Elected the leader of the boys at the beginning of the novel, Ralph is the primary representative of order, civilization, and productive leadership in the novel. While most of the other boys initially are concerned with playing, having fun, and avoiding work, Ralph sets about building huts and thinking of ways to maximize their chances of being rescued. For this reason, Ralph’s power and influence over the other boys are secure at the beginning of the novel. However, as the group gradually succumbs to savage instincts over the course of the novel, Ralph’s position declines precipitously while Jack’s rises. Eventually, most of the boys except Piggy leave Ralph’s group for Jack’s, and Ralph is left alone to be hunted by Jack’s tribe. Ralph’s commitment to civilization and morality is strong, and his main wish is to be rescued and returned to the society of adults. In a sense, this strength gives Ralph a moral victory at the end of the novel, when he casts the Lord of the Flies to the ground and takes up the stake it is impaled on to defend himself against Jack’s hunters.