I find that the choice of kitty litter (clay vs. clumping) often ends up being a matter of individual preference - both for the owner and for the cat.
For instance, my own cat isn't able to use the clumping due to health issues that cause her to sometimes flood the litter box with urine. (She was recently diagnosed with feline diabetes) What happened when I tried to use the clumping litter was that she would walk in the wet litter before I could scoop it out and replace it. It would stick to her feet, making these awful little concrete booties! In an attempt to get it off, she would lick it and ingest it. This resulted in a blockage in her intestines and needless to say, several hundred dollars later, I do not use clumping litter.
However, other people I know use clumping litter quite successfully, and have had no problems with it at all.
So, as I said, I think it is really just a matter of what you and your cat prefer.
Best of luck,