Back when I started, I'd use a 3-inch brush for everything, doors, trim, you name it.
Switched to a 2-inch angled sash brush for the last job and the control was night and day, especially on the window frames. Anyone have a go-to brush for cutting in on textured walls?
My uncle tried to paint his whole house with a four inch brush once. The trim looked like a toddler did it after a sugar rush. I stick to a two inch angled brush for anything that needs a straight line.