I just painted my bedroom and master bath SW Alabaster with SW High Reflective White trim and doors. I LOVE the look, both colors work beautifully together. Depending on the time of day (morning sun) it looks white without being too stark white, as the day progresses it warms up turning into a vanilla cream in the evenings. My bedroom is west facing with more windows and a small south window. My master bath is west facing. The High Reflective White stays pretty true to color at all times. Unfortunately they were not able to do the cabinets in HRW as the paint I used on the cabinets could not be mixed in that color. HRW is a color that is funny at Sherwin Williams and kinda' tricky and definitely takes more coats to cover. I used Emerald paint in Alabaster on ceilings, walls, and cabinets in different finishes and Super Paint in Semi Gloss in HRW for trim and doors. I was nervous about using Alabaster on the cabinets in the bathroom but it worked perfectly. I will say, for those that are using a white on walls that is not as warm as Alabaster/White Dove, or more cooler grays (think grays that aren't greige) the Alabaster or White Dove warm soft whites are going to go yellow/cream. I would recommend going with Pure White for cabinets and trim. It is still a soft white without the creaminess of Alabaster. High Reflective White is also a good white it's not as soft as Pure White but still not so white that it looks cheap, but again HRW is hard to cover and cannot be mixed in many sheens and paints. I decided not to go with Pure White with my Alabaster walls because my husband wanted more of a contrast with the doors and trim, I wanted to use Alabaster on everything, but made a compromise with my husband, and went with HRW. I am not at all disappointed with the look. I know I spent countless hours agonizing over the choices and hopefully this will help others that are in the same position.

Am I correct that the Alabaster will look a little brighter in satin sheen? It could. There is no hard and fast rule about how sheen affects color. Depends on the color and different people perceive it differently. So, you really need to get a sample from the painter of his version of Alabaster in whatever product he's using and go from there. I would opt for the Alabaster option first because it's the easier option, more consistent option and you like how it renders in your space. ETA: make sure you like how his Alabaster goes with your Dover White trim too.

I know this is an older post but if this can help you or someone . . . ..Of the three colors mentioned, Oyster White will give you the look you're after and will look good in bright light and in more dull blue light during winter also. It would look good with Iron Ore and with a more black paint from SW such as Black Magic or Tricorn Black. Alabaster on an exterior can look great but it's much brighter than Oyster White. Snowbound, while one of my personal faves, can have some funny pink undertones at times. As always, test test test! Natural lighting and reflections from trees/ water/ other houses will affect a paint's appearance.

I wouldn't. They're too close in Chroma. Which means neither will make the other look better. Instead you'd most likely end up with two dirty and dingy looking colors of white. The easy option is more Pure White in a different finish (matte) on the walls and leave the ceiling/doors/trim as is.