They are about the same. The ASRock board has the benefit of having 2 more SATA III ports than the Asus board. The Asus board has a slightly better integrated NIC.
I don't have much experience with ASRock boards. I built a budget PC with one back in the day for a family member, it's worked w/o problems for the past 3 years or so. I just get pissed when someone slams a brand cause they had one bad product from them. You'll find many happy ASRock owners on OCN and many that have solid overclocks on the boards too. I wouldn't hesitate to build a rig for myself with one of their boards. I put them on the same tier as Gigabyte, Asus, and MSI.
But for me Asrock products seem proned to malfunctions just due to my experience and the fact that i heard lots of people in real life and on the internet saying that Asrock motherboards are built with low quality materials so they can cater to the budget market for Asus.
Edited by Pentdragon - 8/18/11 at 7:18am