^^^obviously a tasty a chip you've got there - but thats another happy MSI GD65 customer for 24/7 OC.
Im sure all the boards arent too far away from each other in OC capability so its likely to come down to a number of other factors that sway the decision. For me, and my requirements, the MSI is king. Just count the number of "Asus P67 issues" threads and you'll see what i mean about the bios issues as im sure thats what the problem is rather than hardware.
Take a look at ASrock - if I was buying now, thats where my money would go, although very happy with MSI i've heard nothing but good things about the ASrock's - like the stability of MSI, OC potential of Asus and clean functional EFI not far off the solid traditional bios interface of the Gigabytes...