Each of the Four Gospels was written by a different man: Matthew, Mark, Luke, John. Each is of a different length. Matthew has 28 chapters. Mark 16, Luke 24, and John 21 chapters.
Each of the Four Gospels has a different theme. Each writer presents Jesus in a different aspect, like a person who has his picture taken with different poses. The difference in presentation in the Gospels was determined by the experience of the writer and the background of the people to whom he addressed his biography of Jesus.