I'm not going to suggest any specific white because it really depends on your specific slab of marble.

If you can get a sample of your slab and subway tiles, I suggest you bring them to a larger BM dealer that carries the large prepainted color swatches and buy a couple that work best with your samples. While the little sample jars are great, I found I could narrow the colors down more accurately in the store so that I wouldn't need to buy more than a couple of samples. These cost the same as the sample jars, cover about the same square footage, and are a huge time saver over painting the samples yourself..

Bring them home and look at them in your kitchen under different lighting conditions. If you are painting existing cabinets, it should be easy to tape the swatch to the side and set the marble and tiles onto the surfaces. If the existing counters and backsplash colors interfere visually, cover them with white paper before you set the samples on them.

I recently bought several Aura samples to use in my library, and once home, I saw immediately that while they were the correct colors,I needed to go much deeper. I ultimately bought SW paint because of color. The BM dealer mixed up a quart to match the SW French Roast, but the color was not a close enough match and they refunded my money.

If you still have difficulty with colors, you might also pose your question on the Home Decorating forum.

Suggest you try to paint some large samples to look at in your light. Any slight color tendency in the paint will become much more apparent when you have lots of it and it also reflects off itself and amplifies those tendencies.

IMHO it is most important that you really like the color of the white rather than have an exact match to the marble. Just as the color in the walls intensifies by reflecting off each other, that color also reflects off the marble and can make it seem more or less of a contrast so be sure to look at large samples together in your room and pick a white that pleases your eye!

A warm white could look great with cool marble and tile.

I painted the walls of my bedroom a very cool greyed blue-green (HD Glidden's Winter Harbor with some blue added). The woodwork (trim and beadboard wainscoting) is an off-white that has orange undertones (HD Glidden's Pristine Porcelian). The combination keeps the room cool without being sterile.

Remember that satin or gloss finish will look lighter than a paper swatch or the flat paint in the sample jars. You could try a color match if none of the swatches are 'just right' for you.

Also check out BM's "Linen White".