Thanks very much for the recommendation but I've had the book for a few years now. Girod de l'Ain is excellent.
I admire Davout, both as a man and a commander. He was firm, but fair, and demanded exact performance of duty. Having been a commander more than once, I agree with his command style.
Bernadotte is not in the same class. Napoleon gave him a great chance and he failed repeatedly beginning in 1806 when he left Davout in the lurch at Auerstadt. And his actions in 1809 were reprehensible. He turned Sweden from being an enemy of Russia to becoming more or less a client state, and was in on the big land grab also known as the Congress of Vienna when he took Norway from Denmark, although the Norwegians resisted Bernadotte.
I don't see anything to admire in Berdadotte, king of Sweden or not.