I would like to compare Simon with Jack. What have they in common and how they distinguish each other?

As the above post so well indicates, Simon, the peacemaker, and Jack, the warrior, share little but having come from the choister group.

Simon represents the intuitive nature of man, one which is acquired through much thought and mediation and communication with the inner civilized self.  Much like Thoreau and Emerson, Simon seeks the peace and communication he has with Nature.  And, much like Thoreau who went into the woods "deliberately to front the essentials facts of life, and see...what it had to teach," Simon goes into the woods where he senses that evil--the beast--is what lies inside each of them, waiting to be released through one's giving in to primal urges, urges which Jack surrenders his civilized nature to as he becomes a hunter/killer. When Simon is unable to communicate the truth that his inner self knows, Jack and the hunters kill him, to be certain that he will be silenced forever.