Question

why democracy is called the better form of government

Answer 1

Democratic states nearly always have freer people than autocratic states. They obviously have the right to vote for their government so by extension deciding the policy of their nation and what their nation should be like.
They have more freedom of speech and expression than in autocracies. In particular they are free to criticise their own government.

Answer 2

Bcs. It gives right to the people to correct their own mistakes.
It is more accountable form of government. .
It gives right to the citizens to vote, speak, freedom, education and many more.