Kobolds are one of my favorite Monsters. Small and sniviling, they are also clever and think more about the tribe than Goblins do. They makeeffective traps and are better at setting them so they don't get caught in their own traps. Goblin are lazy and might forget where they laid a trap. Kobolds have very few Hit Points so they have to lay ambushes to gain surprise and advantage on more powerful foes.