Either stove can easily cook the living room. So it all comes down to the natural air flow or forced air flow. We all know heat rises, but more important there needs to be a return path for cooler air to the stove room. When I get my stove running in a cold house we close off the back bedrooms until the house is real hot. Then crack the doors to the bedrooms and the cold air rips along the floor back to the stove. Every one has these issues, and we have all learned to burn the right size fire for the conditions. I don't remember the sizes of these stoves, but the Oslo is not a huge fire box. There are much bigger stoves out there. The Oslo does burn well with any size load in it. 600 F for hours to get the house hot, and 150 -300 F to keep it there. The Oslo was right for my 1500 sq ft cathedral ceiling open floor plan house. Which ever one you get, spend the money for the enamel finish. Mine is 12 years old and look like new.