Broiler farms probably do vary a lot from location to location--here in southern WI, they follow fairly reputable practices, but they may be awful in other locations. But at least hoop house chickens here are treated in ways that respect their evolution a bit, as flocking creatures that need to move and peck (they have litter; they can dig and peck; they can interact with each other). Factory layers are kept alone, in tiny cages where they can't move, and it drives them insane, sometimes literally. Some slaughterhouses follow good practices; others don't. Processing plants are notorious for treating workers horribly.

So what do we do? Consumer pressure really makes a huge difference, so it does matter what you buy, and how you use your political and economic influence.