I don't know what to do here. Traditional Chinese - Used in Taiwan, Hong Kong, historical text in mainland China, used with the Chinese living abroad (Most Chinese I know are ABCs), and it is used in the Hanja (which is helpful since I live in Korea). My students in Korea all study the Hanja, so it would be a topic of conversation with them and with the Hanja teacher at my school. It would also be useful in Japan I hear. And I've been reading that people in Taiwan and Hong Kong have a hard time reading Simplified Chinese. Simplified Chinese - Used in modern mainland China and in Singapore. There are over a billion people using it. What would you start off with? Or if you had to choose, which one would you study?