Silver is on left pearl gray on right(darker)

I like the pearl gray. Oh how gorgeous it's gonna be!

I wouldn't use grout. This backspash has no grout, just tight joints.

http://www.familyhandyman.com/DIY-Projects/Tile/Tile-Backsplash/stainless-steel-kitchen-backsplash/View-All

Pearl gray. Beautiful selection of materials BTW. The floor tile is existing?

We used silver on the floor in the shower, it almost disappeared.

Yes floor tile was installed by previous owners throughout house.

Between the two, I would choose the Silver (the lighter choice of the two). You always want your grout to blend in with the tile as much as possible. If neither choice blends well with the tile, visit your local tile shop & have them assist you in selecting a grout color. The stainless with the Kashmir White will look beautiful!

That tile is awesome. It is going to be really beautiful! I vote for silver.

Love the selections you have made. I like my grout to disappear, so I would pick the closest match. Be sure to use unsanded grout so it doesn't scratch the tile.

I would use Custom Building Products Arctic Ice, which is a pale gray.

We are going with the silver grout.
Thanks for the comments!

We are done!

Yeah! Looks beautiful. Love the backsplash with your cabinet knobs. Very rich looking! It's a timeless look that should age well. Congrats!

Stunning! Great work. Very clean and sophisticated space. Enjoy!