I agree. Darker is better for a bathroom. And such a perfect match!

Darker is better; the lighter color could end up framing the tile instead of blending in.

I generally choose whatever grout blends in the best, because I don't like to highlight grout lines. In your case, neither jumps out as the closest match. Stand back and look at the tile and decide which is dominant in the tile. I haven't had issues cleaning light grout, and the light one isn't that light anyway. Your tile and granite seems a little earthy compared to a white subway. Seems a cream would fit in better.

Going with white subway in shower/bath surround because soaker tub is white along with the under mount sinks and toilet. Just wanted the lines to flow up from the bath tub. Trim, doors, and cabinets are also white... not stark white a white with a subtle warmth.

Susie, do you feel neither of these grout colors work? Everything else I saw looked too grey or had a peachy hue.

This tile has 9 different screen patterns and they vary... some darker some lighter, some more golden and warmer

walls are kinda cream so I wanted contrast with the white subway

No I think either would work fine...I just can't be sure if you have more of the darker or lighter colors in your tile, that's why I suggested standing back and looking. A couple pictures look like dark would be better, but one looks like light would be better. I wouldn't be concerned about matching your paint to the grout, I'd be most concerned with making sure the tile and grout work together. However, your paint should complement everything else.

Also, you have a lot of different things going on and the granite has a lot of pattern, so my vote is for whatever blends best with the tile. You don't need too many different focal points.

Went with lighter grout, happy with the results!