A truly magnificent work and one which I credit for my interest in the Civil War. Twenty years later I have him to thank for the hundred or so books on the subject that I have littering my den. (Which my wife calls my "Devil's Den". She thinks she's a very funny individual.)
Burns focused on the entire war, Rhea on a single campaign. And his work came along long after Burns released his documentary. It's a question of focus. I have no reason to doubt Rhea's research, and no criticism of Burns for quoting what up until now where commonly accepted figures.
Sadly most of Burns other works have fallen far short of that project.