When it treatment of secondary topics is better than what you can find anywhere else. For instance I am reading Alexander Mikaberidze’s The Napoleonic Wars: A Global History. Just in the span of a few pages, his treatment of Dessalines and his plan to rule Haiti is excellent. Then his discussion of the French motivations for allowing the Louisiana Purchase is amazing. Yet a page later his take on the evolution of the Swiss confederation, while offered only in passing, is more instructive than I’ve found in books written solely on Switzerland.
This is in the very top tier of history books I ever have read. Highly recommended.