My vote goes to traditional. If you break down your target audience, I would think it ranks like this (in terms of popularity): Taiwan, Hong Kong, and then China. Both Taiwan and Hong Kong uses traditional, so you'll satisfy most of your target audience. I would argue that most overseas Chinese (i.e., those born in Canada or the USA, like me) who learned Chinese would've learned the traditional system as well. Of course, we would prefer the English site, so we wouldn't be your target audience anyways. (
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