Shooting the breeze with Breezie

For those of you who have indoor cats, I am really curious what brand/trype of liter works best for you? I usually buy whatever is on sale, but some of the cheaper brands just do not do a good job at controlling the odor like some of the more popular name brands do, I try to buy in the large 25lb buckets and go through about 2 of those a month with the 3 cats. My one old cat who is 19 has thyroid problems and he goes through liter really fast because he drinks a lot of water.