If I throw out all other considerations, I prefer the system along one wall. But this diagonal placement allows for a more efficient use of the room. My chair sits in the sweet spot and faces the audio system at the maximum available distance, while my wife's chair faces the TV. I can turn about 30 degrees to the right to see the TV, while the wife is about 30 degrees to my left. With the system along one wall, I know exactly what to do. I can set it up in 5 minutes with a tape measure. This way was harder. After weeks of occasional tweaks, I have gotten the speakers located very well. I moved them closer to the walls than I thought would work. And in the end I'm very happy with it.