I recently conducted a survey of types and brands of litter, personal preferences and experiences in a quest for the ultimate litter.
Litter is a very subjective matter, and there is no clear winner.
The best choice for you depends on your individual rabbit's preferences, your own likes and dislikes, your budget, your litter box arrangements, and how you intend to dispose of soiled litter. Needs also vary with the number of rabbits in your house. A lone dwarf rabbit may go through a small bag of litter once per month, while a household of foster rabbits may use 20 pounds of corncob every day. Common concerns about litter include absorption, odor control, affordability, availability, ease of use, and ultimately, what your bunny will tolerate. Others like a litter they can flush down the toilet, and some simply dispose of it in the trash.