[Sniggle]

Some of it depends on how often you plan to have your horses in the stalls.

My wifes horses are very seldom locked in their stalls, as the stalls are left open for the horses to come and go as they wish. We left the floor of the stalls the base material for the pole barn (decomposed granite) and after 3 years there level in the stalls is pretty good.

We did put rubber matting down on the center aisle (12' x 24') to both minimize dust and because the horses for some reason started digging there. That has worked well.

One problem with the rubber mats is that underneath them is a great place for mice to set up their home.