In your opinion who is the most gifted as well as readable of the credible Civil War Historians? Who combines captivating writing with historical accuracy the best?
I don't know why, but Shelby Foote keeps coming to mind, but I have no proof or research to back that up.
Other than that, I'd say John D. Billings, but he was a soldier during the Civil War and wrote his memoir, Hard Tack & Coffee: The Unwritten story of Army Life, in the late nineteenth century and thus probably doesn't count in this context (he's also the only one I've read). My apologies.
I can not decide upon a personal favorite but some of the ones I like and have great respect for off the top of my head are Shelby Foote, James McPherson, James I. Robertson and Bruce Catton.