1. Check out Ralph Lauren - manufactured by Glidden - you will find it whiter than Behr.
2. If you check different lines of Glidden products you will find that they are all different colors of white - due to different toning. Since Behr only makes one grade of paint - this isn't an issue with them.
3. Glidden has a new ceiling paint called EZ Track - which actually goes on PINK! and dries white!! The pink is so you can see if you have missed a spot. Glidden is the only manufacturer to have this sort of product so far.
4. The only place in the world that the "whiteness" of a product matters is in The Home Depot. It is a marketing idea created by Behr. Ask anyone who paints - or any place that professionals shop - hiding is what matters - not whiteness.
Go to a Glidden PK sometime........you will get some good advice......and some real knowledge.