I use the Tidy Cats for Small Spaces in the litterbox upstairs and in the motorhome. One of the main reasons I switched was because in the motorhome, I was constantly smelling the dust. It's like it was always in my nose and even when I was out of the motorhome I could still smell it - uck! The Tidy Cats for Small Spaces still has a little dust, but not anywhere near as much as the regular clumping litter. It works just like the clumping litter and it really helps to cut down on odors also. I still use the regular clumping litter in the boxes in the basement in the house because it's cheaper and because dust is everywhere down there to begin with, so what's a little more?

I've never used the Crystals, but I really like the Small Spaces.