What's the difference? I've got a Gigabyte card at the moment, seems fine to me. I read plenty of reviews before buying and they suggested that the difference between the Pascal cards is negligible - they all overclock to more or less the same degree, which is to say not a huge amount because of Nvidia's built-in limiter.
I had a pair of 670s before that, one from Evga which had a short circuit board and cheapo plastic fan shroud. The other from Asus, which was clearly better built, with a full length board, metal pipes sticking out the side and a heavy metal shroud.
Compared to those two the Gigabyte 1080 is most similar to the Asus, except the shroud is plastic and the logo lights up.