The thing is, we recommend Gigabyte simply because there's nothing to do to make the boards work apart from maybe a couple of BIOS/UEFI settings on the 7-series LGA-1155 boards.
In as much as other boards may work just as well once you've flashed an unsupported BIOS/UEFI, you've pretty much voided your warranty as far as the manufacturer is concerned, if they really wanted to be silly.
I have nothing personal against any of the other brands, but as soon as you start having to deal with modified BIOSes and that kind of stuff, it's no longer something we can recommend, especially considering that it's hard enough to get people to upgrade their BIOS/UEFI in the first place.
Sure, there are several Gigabyte models that are far from perfect for a hack and in most cases, in terms of hardware spec, there are better options from other manufacturers, but they don't offer the same kind of UEFI support as Gigabyte does and until they do, we can't recommend them.
Hopefully this makes sense, as we're not pro Gigabyte for the sake of being pro Gigabyte.