Behavior is a flickering barrage of good and bad opinion and science. Whatever else one might say about the book, the concept is excellent and deserves emulation. Such variation is to be expected, especially with only a handful of years to cogitate for half the chapters. But the Big Questions are not confronted. Chapters from books that had collated references simply lack references.
Nature is much more polished in format.
Neither book really addresses the role of genes in human behavior. That it is inevitably conceptually flawed, is not. Prior to the Modern Synthesis, Mendel and Darwin did pretty well by mapping out phenotypic patterns and not, initially, worrying too much about how they got there. For explicit discussion of how one actually should attempt to explain such patterns, see e.g. Weingart et al.