If they are any kind of contractor, they will use that without you saying. Only question they should have for you is what color.
Speaking on color, I saw it mentioned somewhere to use a dirt type color or something. As long as you take care of the grout/tile, and apply a sealer/protector every six to eight months,you can use ANY color you like.
Grout ends up looking like crap because people don't take proper care of it, and the average consumer is not even aware they need to seal their grout/tile that often.
Today there are products that you simply spray on, and there is no wiping down at all.
Good luck on your project Air Force!