They both have similar features. What do you like about the Gigabyte better?
Firstly I've always been partial to Gigabyte for having quality products, good customer service, and quick updates.
The reset button on-board is also nice. I also favor the positioning of the fan headers. It would be cleaner inside of my case.
And lastly... The aesthetics. Having a window on my case, I wanted something more appealing than the brown color of the ASUS. (also why I ruled out the option of the Asrock Extreme 4)