I vote for traditional chainese. The Grammar is exactly the same, except the characters. However, there my be some localize phases that are specific to Taiwan, Hong Kong or Mainland China.
Keep in mind that most people who can read simplified have no problem reading traditional. However, the reverse is not exactly true. This is from personal experience.
Also, keep in mind your target market.
If the market expended enough, I think eventually, you will have both pages, it is just translating the BIG to GB code, no need to rewrite ... (
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