I wouldn't put marble tile on the bathroom floor. I like the black tile and the honed surface sounds interesting. If you like the look of marble find a porcelain look alike.

Could you post a bit more info. There are 1000s of choices for bathroom floor why only these 2 .

Thank you both for your comments! The room in its previous iteration had colorful tiles going up to about 3.5’, and the walls above that were painted in saturated, deep colors. There were also tiles on the floor, which are now gone. We also ripped out the wall tiles and are planning to replace them with mdf paneling/wainscoting. The paneling will be painted, probably something dark - a gray-blue or very dark teal. Maybe almost black. If possible, we’d like to keep the painted walls. That is the plan for now :)

I still am not really understanding what you have going on.

If I'm understanding correctly, you will have really dark walls. In that case, I would go with a lighter tile than the black slate. I'm not a fan of the marble.

The general idea is something like in the images below but with my walls... I looked at many, many tiles and don’t like the idea of all those grout lines... That’s one of the reasons why I’m thinking of the large stone tiles. Light marble or dark stone-like ceramic.

I like both but considering you want to keep the painted walls, I would go with the darker one to blend it to the wainscoting. And you can have the tile installed with thin grout lines and match the color to the tile.

Thought I would post an update on our powder room project (thank you again for the suggestions!).

I bought a pedestal sink to replace the rather ugly white cabinet that was in the powder room before. I hope the period style of the new sink will go with the rest of the space as it’s now planned...

Since the walls got a bit banged up as we were ripping out the tiles, we decided to go with a wallpaper above the paneling. I fell in love with (and bought!) the pictured wallpaper. It’s a bit crazy and colorful, but I think (and hope!) it will look fab.

For the paneling itself, we will probably choose one of the grayish-blues from the wallpaper.

Given these changes, do you think the gray-white carrare marble tiles would be a good idea for the floor? I know that some of you said that marble is not a good floor option in bathrooms - but we have carrara hex tiles in our upstairs bathroom and after 7 years they still look great, so I’m not necessarily scared of having natural stone here as well.
Any opinions or suggestions are welcome :)

The powder room has been finished for a while, so I thought I’d show a picture. We went with the honed carrera tiles on the floor, but had to get a smaller pedestal sink (the vintage-looking one I loved seemed too big for the space). Overall, I’m pretty happy with it.

I really love your wallpaper and wainscotting and I bet the marble does look good with it. Having the lighter colored floor is good in my eyes, to help prevent disorientation to people like me who might get dizzy in dark room. I love how colorful the room is!

Thank you nancyinmich! The room is actually pretty bright - it’s just challenging to take a decent picture... I have to admit, laying the wallpaper and floor tiles was a challenge that brought us (me mostly) to the brink of sanity... Mainly due to the small size of the room, but also its many wall angles. Finishing it was by far the best part of the project.

The good news is there are wonderful sealers on the market that make tile maintenance easy. I just finished deep cleaning my kitchen grout and will be sealing it with Aqua Mix Tile and Grout Sealer by Custom Building Products. Mfg says it will be good for years to come. It seals the grout so well that even water drops will not penetrate. I was sold. Imagine sealed for years -- music to my ears. They sell all types of sealers and are bound to have one that works for you.

I have honed marble floors in the powder room too - no regrets!

We seled the honed marble floor with three layers of sealant, incluging one after it was grouted. So far so good!