Either or the square stance I always felt gives you more power but it is easier to get hit. Were as too narrow you are harder to hit but you don't generate enough power especially in your power hand.

My problem was I used to use my lead shoulder to set up with my oppenent making me too narrow. When I was told to open my stance abit more by sliding my back foot out. I felt I did get hit a little bit more but my right hand was able to get in a bit easier and stronger. With a little bit more work I think I can kind of mesh them together to become heavyweight champ. Anyway I will just leave now.