The very lightest that will match the tile.

For reference my cabinets are a dark chocolate brown and a white countertop

My color scheme for my kitchen

Match tile as best you can. You want thin grout lines. If your tile has rectified edges you can get small grout lines. But in any case match tile. Get samples made and let the grout dry well.

Btw- go lighter than what you posted. Colors on Internet aren’t true but I would go light but not white.

Skip that tile and cabinet combo entirely. You'll regret it very quickly. Go darker, to a realistic medium wood tone, for the floors. And go lighter on the cabinets.

Look at urethane and epoxy grouts in lighter colors. They won't stain or darken from spills/dirt/time.

Beautiful choices! My last home had similar finishes. The tile was porcelain, so grout lines were very thin. The grout was a tad lighter than the tile, and I had no staining, no issues with cleaning.

Correcton: I just saw a photo, and my grout was darker!

I would match the tile color so it just blends.

I have to agree with @User about the floor choice. Are you still able to change it? That grayish color will make coordinating your upholstery, wall paint, counters, etc. difficult. A natural wood color is neutral and goes with most everything.

No I can’t anymore they just installed cabinets and countertops for me

Lines between wood boards look darker. I’d choose a grout that’s very close to the tile, but not lighter.

We chose a grout that matched our tile very well but am worried it is too light and will look dirty faster. That might be a consideration.