Another helpful tip is our bathroom is about 5 feet wide and about 12 feet deep from entrance to the tub.

here is some testing we did at home.

I happen to love that dark grey floor! But that may be because I don't care for the look of everything "matching" - I like the contrast - I also like the shower to be a showpiece as well - if the tile is the same in the shower and the floor it just starts to blend away ( not that there's anything wrong with that if that is what you are looking for)....

Need to see the layout of bath and photos. What about the shower? The walls? The marble is sophisticated and a good choice but really need to see the space. Grout color will be important to your flooring if you choose to go with the Soho Mulberry. Photo of the bedroom would be most helpful in helping you choose as well.

also, I'd want to know how closely the faux Carrera matches the real stuff on the vanity, because if they're a poor match, then you won't really want them right next to each other. real marble is often a little off-white.

no plain grays in the running?

We just put in a alcove tub / shower which these 3 walls will be tiled with the carrara-like porcelain I posted above, just trying to figure out what do for the floors.

Your bath is long and narrow I personally like the floor tile you chose but still need to see other spaces.

you mean the liked the darker tile for the floor or carrara?

The darker but still need to see spaces.

I personally like the darker because I like the contrast and it is a bolder statement.

Sorry my bathroom is currently gutted so hard to see what it will look like.

Do you have a photo of vanity. Also, what are your plans for the walls.

Although this bath is not like yours it is clean and white. I like the chevron floor design which you could do for texture. If you did the darker tile a totally different look to the space.

I don't have a picture of the vanity - it will be a white vanity.

This is the vanity top I am going with

https://www.aaadistributor.com/natural-granite-vanity-tops-by-lesscare.html

What tile you think would be better for bath surround?
This one that looks like marble

Or this one lighter one:

Here is an example if you did the floor, counter top and shower stall. Not exact but similar. Try to envision the darker floor in this space. Plus less lighting as your space does not have windows. The answer to your earlier question I like the movement in the stone for your bath surround as long as the whites and grays work with what you have chosen already.