There are two Porter books, a bio and a "reader" and both are excellent, imo.
Haven't had much time for lengthy reading lately, but I've made it through the first 4-5 chapters of the Daniels book, It's a very "dry" read, but unlike many people who have knocked this book, I have no problem with the "presumptions" the author makes. He doesn't call them facts, and clearly differentiates facts from generalities. If nothing else, we get a picture of the general milieu that Young grew up in (and a reasonably accurate one, based on what knowledge of early 20th-century southern Louisiana that I've been able to discern from my mother's family. In other words, it "rings true".), and that is useful, I think, because too often Prez is portrayed as The Man Who Fell From Mars or some such, and as John Lewis once pointed somewhere sometime ago, that just ain't so.
But DAMN is it "academic" in tone. At least what I've read of it so far. Maybe the book changes (for better or worse) deeper into it. But so far, I'll give it a "slow but worthy" rating.