I heard lots of good things about swheat scoop but when I tried it I was really disappointed.
For clay litters my favorite is Arm and Hammer super clump (or multi cat) it keep the order down, only has dust when you add more litter. And it clumps very hard.
I'm now using Papurr which is a more earth friendly litter, which is my from paper, and not clay. It still clumps like clay (maybe not as hard as Arm and Hammer but still very good) it comes in scented and unscented, I personally prefer the UNscented one.
And since it's not clay it's 100% flushable and compostable. It cost a little more at the store, but last longer in the litter box, so I think the cost is about equal.
(I have two cats so the litter box is used alot)