If you are only voting with these three, I'd say the gray.

Is there a color you’d recommend? I’m open to suggestions. I also have a lighter, silver gray grout that I’m using for other tile that I could use also.

Gray, but not the one you show.

I also have these two grout color grays as options, although I don’t have a picture of them next to the blue tiles

The silver one

Why the double post?

I tried to comment on my last post but it wouldn’t go through. I also didn’t have the grout samples when I posted the first time.

No problem! You got our attention ;)

maybe the slate gray because there seems to be more of the blue in it?

What are the wall tiles? Bath floor tile? This needs to be considered within the "whole" picture.

The bathroom floor tile are the silver/gray. Wall tiles are the white tiles.

The colors look very different in the two pictures you posted. In the first picture I think white grout. In the second picture I think the blue grout.

Pictures are taken with two different lights. The bathroom has a skylight so it will have a lot of bright light but will be darker depending on the time of day or night.

Def the silver grout for the gray floor and whatever white grout is closest to the white tile.

Maipei silver, then slate grey

I like Tec Silverado. It's a very light cement looking gray.