Hi,
what I can offer you is a structural analysis for both pieces and their comparision. The report of equations is so difficult to obtain so I think you are not going to find anyone who are able to do it. Instead I offer you a comparision in which you can see the concentration of the strees on the corners in oposition to the other.
I have made such a comparisions a lot of times, and the results are what I said.
If you are interested in my collaboration, please contact me.
Best regards.