Wheat litter has the added advantage of being flushable, even into septic systems. Odor control is an important concern of both cats and their people. The more absorbent litters provide more effective odor control. The less-absorbent litters don't readily absorb urine, so it pools in the bottom of the box. From there, either it evaporates into the air as an odorous gas or it acts as a host for odor-generating bacteria.
Many manufacturers tout the advantages of their scented products to cat owners.
With litter choice, as with most things feline, cats will have the final word. All we need to do is pay attention to what they are telling us. Kittens and Clumping Litter Cats of all ages occasionally eat their litter. If you see your kitten or cat eating litter, take the animal to your veterinarian for a checkup. At present, nothing in the scientific literature suggests problems for kittens that ingest clumping litter.