A dictatorship is defined as an autocratic form of government in which the government is ruled by an individual: a dictator. In contemporary usage, dictatorship refers to an autocratic form of absolute rule by leadership unrestricted by law, constitutions, or other political factors in the state
One of the main advantages of incumbency for a democratic election is that the people are used to the incumbent, another would be that the incumbent usually has more money, and other would be that they are used to campaigning.