Those are great sites... you should have included Antietam as well. It really is amazing how lightly visited these places are — just packed with history.
It is. Gettysburg will probably always be the most visited simply because of the fame of the battle and it’s closer to the midwest and northeast.
In 2005, I visited Gettysburg and Antietam the same day. I was especially impressed with Antietam—Sharpsburg, to Southern partisans. It’s less of a tourist trap than Gettysburg, and the area doesn’t seem to have changed much since 1862. The infamous cornfield where thousands were killed is still used for growing corn.