I've read both Gotti: Rise and Fall and Sammy the Bull's Underboss. Underboss gives you deeper insight into what Sammy was thinking when he "ratted" on Gotti (if you believe what he says, that is), while Gotti: Rise and Fall is more or less an objective view, primarily from the law enforcement angle. However, they did use taped evidence to peek into Gotti's world. But I believe, Jade, that the introduction is what the authors imagined Gotti would say, based on his life and the evidence taped. It seems like there's a footnote which states that they attempted to get Gotti to an interview, but he refused. In answer to your question, kakingo, I prefer Gotti: Rise and Fall. It's a little hard to follow at times, but it's a lot more reliable and objective than Sammy's book.