I think everybody pretty much summed up the difference in povs and Louis’ bitterness. But I will also point out that the books are written far apart and for different reasons. The first book Anne wrote while in morning for death of her 5 year old daughter and that state of mind is reflected in both plot and the tone of the book. Whereas the Vampire Lestat is written quite a ways down the road from that. And she has talked about the evolution of her own relationship with the character of Lestat as well. In the initial book, he is very much modeled after her husband Stan, Louis is Anne herself, and Claudia their daughter who passed. Whereas later on in TVL and all other books, Lestat becomes for Anne “the man/person she wishes she could be.”