When would a person need to do a Qualitative research? How is Qualitative research different from Quantitative? Is one easier to do than the other? Which would you prefer to do? Why?

I have to choose a artlce from my reference list and write a qualitative article review, I also have to submit a discussion. Here’s the discussion. When would a person need to do a Qualitative research?  How is Qualitative research different from Quantitative?  Is one easier to do than the other?  Which would you prefer to do?  Why?