I've tried all varieties of litter, initially clay- too dusty!  Then crystals- too expensive!  Pine- I liked that for a long time but I had saw dust everywhere.  And finally we arrived on the paper pellets.  I tried one brand I liked very much but then found it difficult to find again.  We tried a store brain but it didn't kill odor well enough.  Then another paper pellet type which seems to emit its own ammonia odor and finally, Yesterday's News!  This is by far the best.  It can be a bit more expensive but it doesn't track.  It really keeps scent down.  The cats like it.  And it's easy to find and easy to scoop.