It's been 2-3 years since I've used AMD, and I've found that I always dealt with more small annoying bugs with AMD. While you can live with them, it was always annoying how every driver release had a different set of annoyances. I tended to stick with one set of drivers for half a year at a time until I found a new driver that had the fewest set of annoyances.
While Nvidia drivers were never perfect, I tend to be ok just to use what ever driver I have without being annoyed. Some of my issues may have been crossfire related.
As of now, the little things still seem to show up on posts a lot, but AMD has done a lot to fix some major issues since that time.