The first sentence conveys a specific action and context regarding the purchasing behavior of "me and her," while also hinting at a disparity in profit distribution related to authors. The second sentence is a concise summary of the situation but may lack the same level of detail and nuance.
Comparing the effectiveness, the first sentence provides more context about the relationship between the purchasers and the authors, making it more effective in conveying the idea of inequity.
Therefore, the answer is: The first is more effective.