We ended up with a cat becvause it showed up on our doorstep in a rainstorm and even though we never had one before we set out to purchase needed supplies. I purchased Freshstep because it said it controlled odor better than any other litter. We have had our cat for five years now and have used Fresh Step the entire time.
This litter is amazing even when I forget to change the litter box for a few days you can't smell anything. I purchase the 40 lbs container at Costco, they usually have a coupon in their ad every few months so I purchase two containers just so I have enough. I truly believe this is the best cat litter for the money and the only one I will ever purchase. The clumping ablity is very good, I can clean the litter box in no time because it clumps so well. They recommend putting at least 3 inches of litter into the cat box for the best results.
They also make a product for multiple cats and I would think that is every bit as good as the single cat litter.