Affiliated colleges are connected to some other college or university.
They have to follow all the rules and syllabus of that affiliated university.

All the admission process and exam pattern carried by university.

The college will have same question papers and the exam checkers are also decided by affiliated university.

Autonomous colleges have the freedom to choose thier own syllabus, and change it.

Take exams and fests according to their choice.

They don't have to follow any criteria of any university or other college.

Both the colleges are good in all terms.

But, autonomous colleges are better as they have right to take their own decisions and do not have to be in conflict with others.