There are a number of differences and a few similarities between Jack and Ralph. First of all the main similarity is the fact that both boys are roughly the same age. Then furthermore, there is the fact that both pf them are boys. In addition their share the quality of leadership, or in other words both of them have the abilities to be a leader. Then on the other hand there are the numerous differences they in clued; different style of leadership, different believes, maturity, and the symbol that they represent. Jack and Ralph have a very different style of leading.
Ralph has a democratic leadership and Jack is more of a dictator figure. Then furthermore, there is the difference of believes, Jack believes that the main objective on the island is to hunt and Ralph believes that it is to be saved. Then there is the maturity, Ralph is more mature that Jack. And the last difference in the symbols that these characters represent, Jack represents the bad side of human nature and Ralph represents the good side or democracy.
Piggy represents intelligence and thinking. This idea is proven through out the whole book, until his death. Fist of all there is the fact that because of Piggy the boys were able to create the fire. The secondary, idea is the fact that Piggy acts very mature through out the book. He is even more mature than Ralph. Piggy comes up with ideas that not a single other boy had though of. For example there is the fact that Piggy though of the sundial. Furthermore there is the idea that Piggy constantly reminds Ralph of their objective to the island, and which is to be saved.