at this point, its pretty much all personal preference.
gigabyte being the preferred board choice manufacturer comes from 775 days, where they were pretty much the only board manufacturer using the combo of realtek alc audio and realtek lan (what you wanted when those were the closest to what apple used, and there was good driver support in the community), whereas other brands were using via audio and atheros lan etc.
my first hackintosh board was an asus p7p55d which had a 'good' lan controller but via audio (voodoohda needed) however the board itself was great, sleep on timer worked, sleep in general was fine, there were no usb issues (at a time where giga boards needed a dsdt fix for usb iirc). the audio wasnt great though. this scenario was pretty much the same for all board makers except gigabyte, who still were using the more osx compatible realtek/realtek duo.
from 1155 onwards, the 'main 4' consumer boards (gigabyte/asus/msi/asrock) all used fully compatible audio and lan controllers, so the differences became negligible. all (except gigabyte in the beginning) were using uefi which as we know is much better for osx use. the downside was with the uefi implimentation of these other companies was that there was an issue with power management, which depending on how you look at it was easily fixed (could be hard or soft fixed). when giga brought out uefi for 1155, they didnt have power management issues out the box. so giga was still the easiest solution out of the box at that point.
from 1150 onwards, all brands have pretty much been identical in terms of osx usage.
all use uefi without issue, all have boards with compatible controllers for audio lan.
this forum used to be gigabyte orientated because the mission of the site (as i see it) is to provide the easiest and cleanest solution to get osx on pc hardware, so thats what was recommended from the top down. as time has moved on, the site now recommends a variety of brands top down, and the results are seen in user builds from all manufacturers.
my personal preference has been asus since my 775 board died in 2008. i now use an msi board just because it looked good and the colour of the board matched my gfx card! it doesnt really matter.
asking opinions of what people think is a better brand of osx nowadays is imo pointless as what itll be based on either brand loyalty, or lack of awareness due to lack of experience in other brands, or simply because someone wants to reinforce their purchase decision and not feel buyers remorse.
get what you can afford and comes with what you need
