Debate. Public speaking and also making logical and legitimate arguments are skills that you can use in almost any field of study. There skills that will help you for the rest of your life in your job but also in life (Who doesnt like winning an argument). AP lit and classes of that level are great and look good for colleges, and will be helpful if your planning on becoming a writer or a teacher or something like that, but for the most part aren't that useful for say a business career. I would definitely take the debate option as it also seems more fun.