Isn't the Gigabyte running on a newer chipset, the P35 compared to the Asus which is running on the P965, it would be a more fair but harder to answer comparison, if you said Asus P5K and the Gigabyte.
In terms of Ocing ability, Asus and Gigabyte are head to head.
However, many ppl said Asus MB are generally hotter than Gigabyte + RAM are picky.
Also, P35 is the later chipset than P965