anymore, just about any of the 4 main manufacturers are quality units (Asus, AsRock, MSI, Gigabyte).
Myself, it would depend on what I was building, but typically I find Asus to be the best in terms of quality, ease of use, and product support. My next choice is AsRock, then MSI, then Gigabyte.
However, it also has to do with features or color schemes I am going for with a given particular build.
Regardless, as long as you get a motherboard from any manufacturer I mentioned, you should be fine.