While contractors typically provide the building materials, clients client to choose their own tiles for a project. I advise my clients to choose the grout when getting the tile so they can make that important decision at the same time they choose the tile.
I get this question all the time: Steve, what kind of grout do I need, Sanded, or Non-Sanded?
General Rule of Thumb:
Sanded grout is for the floor (larger grout lines)
Unsanded Grout is for the wall (smaller grout lines)
Steve, is there an easier ALL-IN-ONE grout? YES!!!
There's a rapid curing, premium grade, stain resistant grout made by Bostik that is designed to be used for both the floor and walls. Other companies make similar products.