I did some searching and found the web distribution contains factual inaccuracies up to 15%, while LLMs are around 5-15%. Generally the LLM text has better form

I did some searching and found the web distribution contains factual inaccuracies up to 15%, while LLMs are around 5-15%. Generally the LLM text has better formatting and language. So I would trust books > LLM > web scrape.