Limestone is a natural stone that is made from sedimentary rocks. It forms under the bottom of the sea and is pressurized. This makes it very durable. With the right seal, limestone is a very durable flooring that can handle heavily trafficked areas.

Variation is up to your taste but density in general denser is better for longevity, stain resistance, and wear-tear resistance. In general softer and more porous stones will require more maintenance. As you might know, porous stones' absorption rate will be higher and they will stain a lot easier. On the other hand, you can always prevent this by using a heavy-duty sealer but that will cost you more as well.