Which one is better depends ultimately on what you hope to achieve in terms of responses. Anonymous responses may be easier to obtain whereas through an NGT respondents may be shyer to provide more honest responses and consequently require more time. However with individuality comes personalization with this information which depending on the level of attributes obtained could provide more detailed demographical data.
In retrospect as part of my research studies I have unknowingly taken a somewhat hybrid approach whereby the respondents to my research while anonymous provided a great deal of attribute information which allowed me to gauge based on gender, location, age, education etc. The information collected while semi-quantitative allows me to mine information for extended research which has the means to transcend for other avenues of research.
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