Both research methodologies are constructed as distinct research processes.
Both methods of research seek to uncover the richest possible data from a setting or situation.
Both research processes start from the interests of the researchers (they determine what to study as a topic and field of analysis). They start with a question based on the researchers interest in a particular field.
Both methods remain unbiased and valid, representing an accurate representative of the situation. If the data were biased, then both methods would lack a control.
Both methods seek to remain objective and neutral, keeping control.