I'm just a tad Dutch and never like wasting anything. I was also taught (in Photography 101) only crop if you absolutely have to. We were taught to do all the "so called" cropping in camera for printing later, which was of course on rectangular paper. I shot my very first wedding in 35mm. Why? Because that's all I had and all I could afford at the time. After a few weddings I pickup a Koni-Omega 6X7 and the wedding business took off. 6X7 was so nice for printing on the paper formats offered by the lab I was using that I almost never buggered a shot. Then I made a switch to a Bronica S2A and then later to a Hasselblad square system. Then the fun started! I had to mark my screens for "in camera cropping" just to make sure the lab would be able to get everything on the paper. No more shooting "full frame" it was a headache for me and something I had to constantly be aware of. That 6x7 old Koni-Omega might have been a clunker, but it made weddings easier for me anyway. Now that I am retired and shoot for MY pleasure and not the brides mother, I can shoot almost anyway I want. But, like I said, I'm Dutch and still do not like wasting either film sq.in. or paper sq.in.. So, I prefer 6X7 to 6X6. I will still use a Rolleiflex or my Hasselblad on occasion, but almost never print square. I guess it's just and old habit and old habits die hard for this old dog. Hmmm, I'll have to see if Ansel Adams printed square with his Hasselblad toward the end of his later years of shooting? Not that it makes any difference to me, but I'm just curious now.