A student asked me the following useful question:
I am confused about the question "Do the advantages outweigh the disadvantages?". Is this an opinion question or discussion + opinion question?
Here's my answer:
Strictly speaking, "Do the advantages outweigh the disadvantages?" is asking for your opinion (do you think there are more advantages or disadvantages?). Technically, you could give a one-sided "opinion" answer e.g. you could argue that there are many advantages and almost no disadvantages.
However, I think the examiner would expect and prefer to see a balanced discussion of both sides as well as your opinion. Therefore, I think it's best (and easiest) to write a discussion + opinion essay.