They all say the same thing, according to David McCandless:

The bulk of the words in horoscopes (at least 90%) are the same. That’s not a full, proper statistical analysis. (If you are a statistician and you want to do a proper analysis, please get in touch) The cool thing is, once you’ve isolated the most common words, you can actually write a generic, meta prediction that would apply to all star signs, every day of the year.

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