I felt like Homo Deus was largely a retread of Sapiens. Some of his speculations about the various forms of humanism that have arisen in the 20th century were interesting, but for most of the book it felt like he was treading very familiar ground. It seemed like Harari was in a rush to release another book after the runaway success of Sapiens, and because of that he didn't take his time writing it. Sapiens was very concise and felt like the product of years of careful thought. Homo Deus felt like it was rushed in comparison. Still a good read, don't get me wrong. For a similar type of book I would recommend Howard Bloom's Lucifer Principle and Global Brain. They both take a similarly broad scientific perspective on human history and behavior, and both are fun reads.
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