For exterior, the only paint I will use is $herwin-William$ Duration... paint is cheap compared to labor. It lasts like no other imo. I'm not AS picky on brand for interiors, but go with SW's good stuff too. Having a "pro acct" saves as much as 30% or so ... none of it is cheap.
I use what I use because of several pros recommending it decades ago....
I HATE painting ... now
