Downloaded it a while ago when it was a reasonable $9.99. Now the Kindle price is outrageous. Plus, he turned OFF the text-to-speech feature, so the visually-impaired will be out of luck. I would not buy it now for either of those two reasons.
I believe White is a more facile writer than Donald, but the latter is far superior in research, particularly about Lincoln's early life. An equally reliable chronicler of Lincoln is Douglas Wilson who together with an associate has gathered the research of Billy Herndon in a book titled Herndon's Informants. Wilson has also written Honor's Voice about Lincoln's early life. It is good to keep in mind that much of what we know about his early life was written by people through the prism of his Presidency.