Taste is so personal.
The best biography I have ever read is
The Power Broker: Robert Moses and the Fall of New York. But I've heard that when it was assigned as summer reading at the Columbia School of Journalism, hardly anybody finished it.
Check out Jung Chang. Some scholars didn't like her Mao book, but I don't think there are many votes, this side of the PRC government, against her
Empress Dowager Cixi: The Concubine Who Launched Modern China.
Walter Isaacson is outstanding, so I was surprised to find myself not finishing his Kissinger book. That's probably my fault. And there's not much better than his Franklin volume.
Fawn Brodie was a great biographer. But not one of her titles seems to be available as a proofread eBook. If you aren't bothered by misscans, and your library is cooperating, you could try this:
https://openlibrary.org/works/OL7329...e_of_the_South