It’s much more difficult to work with and the smell is harsh, but it’s an excellent choice for bathrooms as it’s watertight.

Who is doing the grouting? What application? An experienced installer will tell you want he prefers to use.

I agree the tile setter is the best person to ask

Sorry but there are a lot of bad installers out there, so be informed and eduate yourself! Just because an installer has a preference doesn't mean that is the best option.

epoxy, if you can find it in the color you want.

If you are installing tiles in your home then you need to apply grout epoxy on tiles because it is very important to fill group in gaps.

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