Price-wise, World’s Best Cat Litter isn’t cheap, but I use less per change than clay. The clumps don’t waste extra litter, so the bag lasts longer. Odor control improves a lot if you keep the depth right. I also noticed a difference when I upgraded food to Nature’s Domain. Less stink in, less stink out. It’s not the best cat litter in the world for everyone, but it works well in my setup.