Noobie from thoose comments.
The review says the Bios makes it better, and that review was written on release day.
My NF4 Gigabyte K8N pro sli didnt support x2 processors, a week later it did with no issues.
Maybe that board has issues, I have only used the normal premium heatpiped version, but they would make sure it was compatable with ATI cards, guaranteed, 100%.
There wont be issues whichever way you go, just the Nvidia userbase is in its 4th generation, more mature and easier to get support for.
Support for me if something went wrong is a huge draw, and the NF4 is more popular at the moment.