Behr in my opinion, but honestly, I never use anything but Benjamin Moore.

BEHR! Im a behr lover. Used to paint professionally. (I do not like the behr with primer included however.) Just regular original behr.
I did try some of the glidden exterior recently. Back in the day the product was of poor quality, but I think they have improved their paint in recent years. I was just painting a porch ceiling so I went with it. Was fine and dandy.
Most people on here will say benjamin moore or sherwin williams, which are both quality products as well. I have painted for interior decorators and they almost always use BM....maybe they don't like to go to home depot.... ??? Behr is just as good!
My grandfather was a pro house painter and he was a sherwin williams guy!

Which ever one Home Depot uses....Behr? If you are looking for the best paint on the planet, that would be Benjamin Moore. They have reinvented paint and have far and away the best, as their products are remarkable for many reasons. Those of us who are fans will be happy to opine. :)

Neither. Benjamin Moore or Sherwin Williams.

Its a personal choice , and see what is wallet friendly , if that is what you want to know .

Dulux by far beats behr. Granted not all their products are great but their Diamond is amazing IF you are looking for a matte. Unfortunately their eggshell is really high sheen and I only use it for trim when using matte on the walls. It has a ceramic in it making it durable and scrubbable. By far beats any matte on the market including aura and I have painted with both many times (I own a painting company for the last 13 years). Designers love Ben moore cause their colours are great but their paint is not. Most painters I know refuse to use it. If ben moore didnt have designers pushing their products they would go under i am sure. Their pr is the best of the best but unfortunately their products fall short of their promises and we have tested all their product lines. . Dulux also carries lifemaster and I get great reports from my clients about the merits of that line also.