I was jus talking to the owner of a computer store nearby and asked him about the choice. He told me both brands would be just fine, but asrock is highly focused on low cost motherboards, although the quality is quite good for the price.
I also found some reviews, but they didnt really help me so much at all
Anyway, there was a Hi Fi A55S3 from biostar on stock, so he recommended me to simply try it. Thats why i am using it right now and first round of crysis was really good with it
Thanks for your help and thoughts, guys!!