I started with the Campchef Everest rated at two 20,000 BTU burners. In my experience, that's greatly exaggerated. It literally took over an hour to boil a pot of water. The Atwood RV stove with one 9000 BTU and one 6500 BTU burner performs much better. Other's experience may vary.
EDIT: I stand corrected. I just completed some experiments. In a side-by-side test to boil identical pots of water, the RV stove outperformed the Campchef by a large margin WHEN BOTH WERE CONNECTED TO THE RV LOW-PRESSURE LP. When I connected the Campchef to a small propane bottle using the LP regulator that came with the stove, it was WAY more powerful than the RV stove, boiling water in a fraction of the time. Obviously, Campchef uses a regulator with much higher pressure than an RV regulator and the result is much more heat output.