The following is the difference between democracy versus dictatorship and aristocracy: 

Democracy:

Such a system of governance, as expected, where sovereignty resides in people, is called democracy. This administration is people’s administration. In this, people, directly or indirectly, through the elected representatives, run the government. In this, government is answerable to the people. This system works for public welfare. In case, it is not performing as expected, the people have the right to change it in the following election.

Dictatorship: 

Such an administration, where sovereignty rests in one person, is called dictatorship. In this, governance rests with one person or a group of persons. He remains in power by virtue of his military strength. In this type of administration, the people have no voice, no rights. In this, a common person has no value. Because of being based on violence and terror, there is always a possibility of revolution. It is against the democratic process.

Aristocracy: 

In aristocracy, political governance is in the hands of some persons of the society, whose base is not intellect and knowledge, but it includes persons born in high class of the society or the wealthy class. In it, heredity is more important. In this type of administration, there is immense possibility of revolution since the people hate the administrator and administration. General public is treated with bias. Aristocracy is just opposite to democratic perception.