Here are some comparative essay topics for your information:
Writing on a comparative essay topic, try to keep your own impartiality. Do not make needless statement. Here you do not need to argue. You are to compare. And a comparison may be considered reasonable only in case of an author’s fairness.
Some good comparative essay topic examples

Comparative Essay Topics? | Yahoo Answers
If you choose to write on comparative essay topics you need to understand that you have to do a lot more research especially because here you will be comparing two or more things thus you will be working on more things than two things. For example if you are to compare the movie era of the past to the era of today then you will have to research both the eras and then compare them.
Comparative Essay Topics | Best Essay for You
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Comparative essays needs two or more topics based on comparison. The technique of comparison has proved to be one of the most effective for analyzing the characteristics of a topic. For that reason, comparative essays are quite common in academia. The objective of the assignment is to put together a theory, using comparative assessment methods, about the topics. The theory which would be the thesis of your essay will be the conclusion of the topics. You can write comparative essays on almost any topic as long as you know the specific requirements of comparative essay topics.Comparative essays assess two or more topics based on comparison. The technique of comparison has proved to be one of the most effective ones for analyzing the characteristics of a topic. For that reason, comparative essays are quite common in academia. The objective of the assignment is to put together a theory, using comparative assessment methods, about the topics. The theory which would be the thesis of your essay will be the conclusion you reach about the topics. You can write comparative essays on almost any topic as long as you know the specific requirements of comparative essay topics.