Why 2 different grouts ? As for the caulking maybe clear , I have no idea without pics.

Using a medium gray grout (pewter) on the floor to go with the gray tile and a light gray (warm gray) on the walls to go with white tile. Sorry I do not have pics yet.

I prefer to caulk where the two tiles meet... I like to match thhe grout to the tile, or the very least compliment it. You want to notice the tile NOT the grout lines.

Caulk will used where needed. Where the walls meet the caulk will match the warm gray grout used on the walls.

Didn't know if that same caulk shade should be used where the bottom of the wall tiles meet the floor tile. Or if the caulk there should match the pewter grout used for the floor instead.

My shower has medium gray grout on the walls with white subway tile. The floor is blue penny round with black grout. I’ve never thought about the question but I just looked at the caulk around the edge of the shower floor is black. I think it would look odd with lighter grout. BTW, I do not recommend black grout in a shower. There is a white film over much of the grout that I can’t remove at least with natural cleaners. Any recommendations on that?

I have white shower wall tile with white grout and gray hex tile on the shower floor with gray grout. The grout where the walls meet the floor is gray.

i have warm gray grout on my walls, charcoal on my floor. i did the warm gray in vertical corners. between floor and wall, I did the charcoal

Emily*** same thing w/mine. it's the minerals in the water. you can try using a mineral remover cleaner (but mine is marble so I can't use harsh products)

Thank you all. I thought matching to the floor would be better and that seems to be the consensus.