There is no "best" motherboard. Decide on a budget and pick out the board with the features you will use. You can also read some newegg reviews and download the board manual before ordering, checking out the bios adjustments for overclocking, etc.
All companies have a Best product. For example with Nvidia graphics cards its the 295, for intel CPUs its the 975. Same applies to Asus motherboards. I have no budget, thats why I am asking what their best one is.