I am by no means a professional painter... but having done a fair amount, if for no other reason, go with a SW level paint due to application. Behr and Valspar is like dealing with yogurt and decent paint (I have used both SW Super Paint and Duration) goes on so much smoother. The time saved and much lower frustration level makes it worth it to me. Also, if you are going for bold colors (especially reds) my girlfriend went out and got Behr in a red. I took up the task after she put down two coats and it looked streaky and awful. Another 2 coats later it finally was acceptable. In the new house, 2 coats of Duration in a red covered without an issue.
I still don't understand how Behr does so well on the CR ratings though. The only thing I can figure is that they don't take into account long term wear as a room I did in my place with Duration looks immaculate 3 years later where as the previous owner did Behr in many parts of the house before selling me the house (again roughly 3 years ago) and it simply looks worn for lack of a better description. It just doesn't hold up.