Both are solid boards, nearly identical. I would choose the ASRock for the looks and the sheer amount of reviews. 4 eggs with 650 review is pretty good.
Looks aren't really important to me. I do wish the ASUS had more reviews but I've always found that no matter what board you look at most reviews say its great and a few say there were multiple DOAs and its terrible. Doesn't seem like any choice is fool-proof