1) The first factor that you should consider is your own interest in a particular topic. Choosing a subject matter which you are not interested in will leave you frustrated and confused throughout the whole process of writing and researching about it. Also, keep in mind that it might be difficult for others to get interested in your subject matter if you yourself don't find it interesting enough. So always pick a topic which interests you the most.
2) The next factor is how much research material is available to support your claims. This is essential when choosing an argumentative essay topics because if it doesn’t have enough supporting evidence, then your whole idea might just collapse on itself like.