I have ran many Gigabyte products, MB's.GPUs and otherwise. Not a single issue. I have also ran all the other brands as well. No major issues either.Gigabyte is having some issues here and there lately... Like they are kinda noisy
I personally feel that the majority of gamers here love msi and they have their reasons, though the asus is really good too, there's a tiny difference
You can buy either with no regrets, they are both cool and silent
If people slightly prefer msi there is a reason, but isn't big deal, the difference is so irrelevant that if you prefer you can even pick the video card by aesthetic beauty
For the record my pair of G1 970's are quiet and OC like a beast.