Everyone says with Pure White, Extra White, or similar whites, do everything the same white otherwise they will clash. Pure White with Extra White trim for example will make the Pure White look yellow or dingy. Doing it all in the same Pure White is better, just use different sheens.

I am a big fan of SW Alabaster White. I live in a house with lots of natural light, lots of wood, colorful artwork. This color is a wonderful warm white. I love it so much, that in the new house we are building I am using it again. It helps that the house is sited the same direction and is not very far away so I know how the light will reflect. But the new house is different style, there is still a lot of wood, but there is also a bit of metal with iron beams and railings. The color still looks great. I did the trim in SW Highly Reflective White it is a brighter white and really pops. I have a pantry cabinet wall which is wood, not sheetrock and I dont mind the difference in the way the paint sheen is, it works fine for me.

Test both in huge samples on your walls. All color varies with exposure and its setting. Nobody here has YOUR room or your house. Paint the whole wall. There is no better way. In fact, to truly know is to paint all four walls. Simply white is warmer, but can take on a yellow green cast depending time of day, and exposure. If you are trying to paint a dim room into the light? I never find that successful. Try a "color" versus white and yes white is a color. white is at it's best in lots of natural light, multiple exposures. . A primarily northern exposure generally is not that. A "swatch" is several feet by several feet, and on several walls. : ) Best way is LARGE poster boards and move them around.......or just roll. All paint needs two coats, anyway. Your trim choice also matters.

they can be diff. or pick a light contrasting color. I did Simply White on my walls in the room, but in the kitchen I did Light Pewter hard to get a good photo of both in one shot,,,, but the Light pewter is the wall next to fridge and the open shelving coffee bar,,,,Simply White is in the family room. My cabs are a shade brighter than simply White. the LED lights are Daylight, or 4000K better shot of Light Pewter. the Trim is semi gloss Simply White. so is the baseboard and crown the pantry room is also the pewter color. So you really don't have to do another white. I think it adds a bit more interest to do a slight contrast in color.