I have read several of his books. Of course 1776 and John Adams, but also the one on the Wright Brothers, Americans in Paris (that one is actually a good one that doesn't get much fanfare), his Truman bio (made me appreciate him much more but a little too long in my opinion) and his book of speeches.
I would say that John Adams is still my favorite, but this one probably ranks second. I will also that I was a little apprehensive to read this book since it was the second on that he wrote, and I was worried that he would fall in my estimation because I assumed his quality of writing would have greatly improved since most of what I read are his later works, but I was wrong, the writing is terrific and very engaging.