I may be only speaking for myself here, but I've found that I have two completely different type of sessions when I am out photographing. Most typically, I'm definitely out photographing and I find a place where I photograph purposively, extensively, intensely for a few hours or even a few days. There are other occasions, however, when I'm not really looking for photographs, but they appear without me searching for them. These two styles of photographing require different equipment that can equally produce useful images.