I guess format preference is very personal. Ansel Adams used a Hasselblad for most of his work in the latter part of his life, and cropped everything into a rectangle. I don't think I've ever seen a square image from him. He said the had no problem visualizing the rectangular crop he wanted in the square viewfinder of the Hasselblad. Personally I like the 2:3 aspect ratio for horizontals, but frequently find myself cropping something off the top or bottom with verticals. We all see differently. But I certainly support aspect ratio freedom. It never made sense to me that when Canon and Nikon started making digital cameras they stuck with the 2:3 aspect ratio. Why not square, or even better, circular (to match the lens coverage), and let people crop however they want, plus save us the annoyance of having to flop the camera sideways for vertical or portrait orientation?