I always found clay litters too heavy. Having 2 cats that liked to use the same litter box, in the same corner, made for a mucky mess. I tried pine and crystal litters but missed the clumps. After trying World's Best I wouldn't use anything else. It clumps well, lasts MUCH longer than clay litters, and is healthier for humans and cats alike. It is also completely edible, so no need to worry about kitty injesting a bit while cleaning or is some gets into a water dish. (I've NEVER noticed litter stuck in my kitty's paws with this litter). I didn't like the smell of the unscented versions much, and my cat doesn't mind the lavender scent, so we get this. It also leaves my kitty smelling like lavender, instead of llike 'cat litter'. The only bad thing is that the clumps can be quite large. The company has made a new version that is supossed to create smaller clumps, if that's an issue for anyone.