Cat Litter What’s the Best Cat Litter: Clumping vs Non Clumping litter? Choosing the best type of cat litter for you and your kitty comes down to clumping vs non-clumping litter. Use these facts to make your choice. Arm and Hammer Sifting Litter Box – Is It The Best? Is the Arm & Hammer Sifting Cat Litter Box the best sifting box you can buy? Read our review to see how it compares with its three main rivals.