None of them, really. What brand grout are you using? Mapei has Warm Gray which is very light.

MATCH the floor tile as closly as is possible.. TIP choose your grout when you choose your tile in a tile STORE. All the grout samples are right there in front to of you : )

A much lighter gray take a tile go shopping .I don’t usually say that but with those tiles it is appropriate.

The problem with choosing a grout in the store...using their samples, is that the sample in the showroom will be a different dye lot than the tile you order in. I like to wait until the actual order is in hand and have the customer choose the grout within their own home...lighting, colors on walls etc all play a big role. What may blend in the store may look pink in your home.

MAPEI Flexcolor CQ will always be true to color, and because it’s acrylic based, never needs sealing. Their Warm Gray is the perfect choice for 90% of the marble look tiles around. On the shelf at Lowes, in the half gallon size.

The lighter grey, I think would look best.

Thanks everyone on your valuable input!!!! look for after photos soon!