I've never smoked Chatham Manor, so I have no frame of reference.
The one review I read gave CM an edge over CH, and I hold Russ' blends in high regard. Supposedly, there's is a Sutliff blend called Estate that was formerly CM... And as far as I can tell CM is still available.
I have plenty of CH available, and it works for me, so I'm not inclined to go purchase more tobacco just to see if one is marginally "better" than another...