Bill was correct in what I meant (thanks Bill). With regard to the format ratio, I'm not suggesting any are better, but it is what you get use to. If you use only one format for most or all of the time, you get to know how a scene you are viewing would fit into that shape (be it landscape or portrait and what you could exclude/include). This becomes even easier if you are also only using one lens of fixed focus length, as you also have a better idea of where to stand before you look through the viewfinder. In other words that 3:2 ratio becomes dynamic to you, as you find it easier to compose within that format.
