What is suitable data collection method?

It's always a question a researcher must answer: What is suitable data collection method? Qualitative or Quantitative?

I am currently reading a dissertation from RMIT University in Australia entitled The Internationalisation of Higher Education in Thailand:  Case Studies of Two English-Medeum Business Graduate Programs.  The author Ms. Supaporn Chalapati used a combination of qualitative and quantitative techniques but with the emphasis on the qualitative approach. Quantative data was collected from surveys as a supplement to data collected from interviews, focus group, literature research and observation.  While Qualitative data are likely to take the form of the language of images, feelings and impressions; as repondents describe the qualities of the events under study. 

It is generally defined that Qualitative approaches are complex rich data and deals with the meaning, understanding, interpretation of data collected.  While Quantitative approaches are simple numeric data and deals with the measurement, explanation and prediction of data collected. 

As Dr. Arunee said; "hybrid approach is commonly used nowadays".  I think because it is more likely to give a concerntrated reult of the study.  Collecting data in both ways will provide the researcher the benefit of seeing all views of the study.