From the thicknesses of thin and thick (8 mm and 12 mm more about).

From an environmental point of view of the thin-thick than good. Because the thin, less plastic used per unit area. Thick, thin, high density is better, impact resistance almost, but the foot feeling slightly better. In fact, the difference is not large. In fact, these two are no quality difference between the thickness of the floor, the key is to look at personal choice.