Which would you recommend? Which are the quietest rooms in each? I understand that both are on a busy road and I am a little concerned. Thanks!

Camden SC?

Camden Maine

Hartstone Inn is a very expensive but wonderful gourmet dining experience. The owners are both accomplished chefs. Hartstone Inn was written up in the Food and Wine magazine a couple of years ago for the dining experience.
When we walked over to Hartstone to make our dinner reservations, we were given a chance to see a couple of the rooms which were very nice. But, not having ever stayed there, I couldn't comment. Good Luck.

Both places are on the main highway, but at opposite ends of the town. Check out their websites which have virtual tours.