Grout lines that are 1/8" is the dividing line. Either sanded or unsanded can be used in 1/8" grout joints with no problems.
Sanded grout can be used most anywhere you want to use it IF the joints are 1/8" or more. The guy on You-Tube has no idea what he is talking about if he said sanded grout was only for floors. That's nonsense!
Sanded grout can be used most anywhere you want to use it IF the joints are 1/8" or more. The guy on You-Tube has no idea what he is talking about if he said sanded grout was only for floors. That's nonsense!