Bathroom tiles - grout options

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My next job is buying tiles - I've decided large grey metro tiles for the family bathroom - what colour grout? and how thick? I'm leaning towards white grout but have no idea about thickness of the grout spacers? 2-3-4-5?? any advice?

Not white grout!

Choose a dark grey grout. I think I had 4mm spacers but can't really remember.

No way dark grout, we had that and it turns white with the water marks. Horrible to clean. Just awful.

We now have a silvery grey and it's perfect, not a mark on it after a year and only normal cleaning has kept it fresh looking.

Light grey grout.

Spacer depends on size of tile: bigger the tile, bigger the grout it can handle.

I think dark grey grout is really unforgiving. Go white or light grey. Our tiler put a few tiles tiles up so we could decide on spacing. Plus had to decide on horizontal or vertical and brick or not. Lots of decisions!

Definitely not white, and I would agree with PPs that a silver/light grey grout will be nicer than a dark grey. Silver grey doesn't discolour like white does, but also doesn't show white limescale - plus it will break up the dark grey of the tiles really nicely. Sometimes if the grey is too dark it sort of looks like they haven't been grouted at all, if you see what I mean, but light grey looks really nice.