What are the advantages of 人类将如何演变 over 人性会怎么改变?
人性会怎么改变  vs. 人类将如何演变



人性 mainly refers to " human morality". 人性会怎么改变 means "how will humankind's morality be changed by this technology?  We see many examples of technology changes human's behavior and moral value. If it is your main concern, you should choose 人性 over 人类
人类 mainly refers to "the human kind" in a broad sense. That includes biological and mental aspects. If this technology changes not only human's mind, but also body, then you should use 人类 over 人性
会(would) and 将(will) are both valid in this sentence.
怎么 and 如何 means the same, just 怎么 is more colloquial and 如何 is more literary
改变 = change; 演变 = evolve. A technology no matter how advance, it is not likely to change humankind  biologically. 改变 should be the right choice.


Base on your main concern (human morality vs. biological and mental change) you can choose to write:


人性会怎么改变?/ 人性将怎么改变?/ 人性会如何改变?
人类将如何改变?/ 人类会如何改变?


You can replace 将 or 会 with 将会