You bring up a good point that there are many topic questions which don't have only two answers or just two ways that people think about the issue. Here are some of the best topics to produce a compelling discussion from a variety of perspectives:
"What is the best way to choose a marriage partner?"
"What is the best diet for losing weight?"
"What makes someone "beautiful?"
"What is the best way to solve the problem of....(homelessness, racism, poverty or any other social issue)?"
"What is the best way to study to get top grades?"