The advantages and disadvantages between unitary, confederate and federal forms of government are in the way they maintain law and order. Basically, the major differences between these forms of government come down to how they share political power and recognize sovereignty. These differences include a state absolutely controlling legislation, several states executing external and internal policy or states collectively following two sets of law.
In a unitary system of government, the state acts as a sovereign entity and legislates regarding the day-to-day operations within the districts its territory. In a unitary form of government, there is not a system for limiting or checking the power of the state. In a confederate form of government, different states have their own interpretation of laws that bind the territory together. In this type of government, states interpret and execute law with different results even though the legislation is consistent on paper. In a federal form of government, the states act as unitary entities and have their own set of laws while at the same time follow federal legislation. These federal forms of government specialize in having defined limits of power for the states individually and collectively.
The advantages and disadvantages of a unitary, confederate and federal government depend on the size of the state and the nation of people who make up the constituency. Unitary and federal government are usually more stable and powerful than confederacies, while at the same time, they tend to present more complications when it comes passing law.