Picking a topic, in my opinion, is one of the toughest parts of the speech year. With your decision comes the realization that you are stuck with whatever you pick. So, with that in mind, you must consider a few areas which will help you to arrive at the best choice for you.
First thing to consider? Pick a serious topic. If that seems too close-minded, hear me out. My style of communication was always humorous. It was my personality and what worked best for me so I stuck with it. But the real reason why you should choose a serious topic is for the sake of substance. Humor should be part of your delivery; not the foundation of your speech.
Don't pick morbid topics either. Nobody cares about euthenasia. It is disgusting, somber and can ruin the entire mood of the round. Other topics to avoid are death, eating disorders, and depression. These dont make the audience feel comfortable at all.
Given these two guidelines, the rest of the topics are pretty wide open. Remember to have fun, but in the process of doing so, hit home a serious point that can leave an indeliable impression on your audience. In the end, this will be the path to first place each and every round.