ASRock is a company created by ASUS to make motherboards for the mainstream market.
The ASUS brand is retained for the premium market.
If you want PCI Express 3.0 then there is only one choice out of those two, the ASRock P67 Extreme4 Gen3.
Otherwise just choose based on the features you want and what your budget can handle.
okay thanks. i went with the asus. lol mainly cause of the bluetooth.