I have spoken to professional painters and have heard mixed reviews, so it is really hard to KNOW, until you try it.
I did some research and because Behr has good reviews on it's UV protection, that is what I used in a very sun filled room in my home. Thus far, there is no fading, but it has not yet even been a year since I painted. The Behr went on very well and had fantastic coverage. Plus, zero splat marks on my eye glasses.
But, overall, I love Benjamin Moore paints, but the prices have gone so high and I am not convinced that overall it is the BEST paint out there. I repaint about every 7 to 10 years and have never been unhappy with any paint I have tried, whether it be Pittsburgh, Ben Moore, Behr or Sherwin Williams.