Paint question

Reader Christine wrote to me, asking for more information about paint.

In your profession, what brand paint do you use most or do you let your clients tell you what they want? I am curious about the process.

The two brands I spec the most often are Benjamin Moore (BM) and Sherwin Williams (SW). Both brands are high quality paint, and that makes all the difference when you're applying the product, and looking for a beautiful, long-lasting surface. I prefer BM's color choices, but there are more SW retail stores around, so often, clients or their painters will opt for SW because of availability. Sometimes it's hard to replicate a certain color from one brand into another. Each brand's base has a different chemical make-up, and so pigment reacts differently with each base. Also, certain paint systems work with 10-12 pigments, while others work with only 6. If you're dealing with a full-spectrum paint, like Donald Kaufman, you can't match those colors in BM, because the latter uses black to tone down a color, while the former uses the compliment of the color.I've found that certain brands do a better job with particular colors. For instance, I've learned that Pratt and Lambert is awesome for deep base colors like navy and deep rich reds. BM reds tend to be pinky. And SW has a significant problem with their deep base, and reds tend to run and streak.

But anyways, I digress. Has anyone noticed other specific traits of a paint brand that influence your decision about which to chose for a project? Any brand favorites?