I think it depends on how the rooms interact. Generally the more consistent with trim you can be the better. The harsher whites tend to show allot of dust and wear over time. My general rule is to try and blend rooms throughout the house together as seamlessly as possible with an overall general color pallet. Then using pops of colors for drama in certain areas - ie fun powder room colors, smaller areas, or in your accessories. Over time you'll probably have to repaint the trim in the house so you can always systematically change them all. Hope that helps!