Why is the National Crime Victimization Survey considered by many researchers to show a more accurate picture of crime in the United States than other data collection methods?

Why is the National Crime Victimization Survey considered by many researchers to show a more accurate picture of crime in the United States than other data collection methods? What types of crime data are reported for this survey, and how are data gathered and percentages calculated? What is the major criticism of the data collection methods used for this report? Do you think the criticism is valid? Why, or why not?