Answer:
Advantages and Disadvantages of a Unitary System:
Advantages: Less Arguments
Disadvantages: Less Ideas, everything can be automatically overruled by leader
Advantages and Disadvantages of a Federal System:
Advantages: More Ideas, multiple views, less bias
Disadvantages: Argument, varied viewpoints, decisions take long to formulate
Advantages and Disadvantages of a Confederate System:
Advantages: States/Nations can support each other, states/nations can work together for different causes (war, etc.)
Disadvantages: More Argument, different currencies or economies