The most important factor to consider is the fairness of both sides in the debate. Think about it, if one side is controversial and the other side has no argument at all, how can this argument continue? Therefore, in the debate, neither side can be an objective fact or truth. For example, the sun rises in the east? At first glance, this is an indisputable debate.
Of course, there are other factors, according to the debater's age and knowledge, it is best to match his age. For example, students debate, let's talk about one: should we remarry after divorce? As a student, this kind of problem has never been experienced at all, so the opinions are basically based on speculation, without depth and strength, and many unrealistic arguments are more likely to appear, which will seriously reduce the quality of debate.
Moreover, the content of the debate should conform to the times and there should not be too many hypothetical situations. The content of the debate should be positive, and don't engage in debates with more jokes than arguments. This kind of debate is not suitable for the debate field, but more suitable for the exhibition game.
The above is my personal opinion, which can be used as a reference.