Does quartz stain more easily than granite?

The other way round, for most of what happens in a kitchen. Quartz is non-porous, so red wine, coffee, oil and turmeric sit on the surface and wipe away. Unsealed granite absorbs all four, and the oil marks are the ones that do not come out. Where quartz does lose is heat and ultraviolet light: a hot pan can leave a mark that will not polish out, and a lighter quartz in a kitchen with direct afternoon sun can yellow slightly over years. Granite does neither.