What cat litter is best for multi-cat households?

Reviewers consistently recommend hard-clumping formulas with strong odor neutralizers — Dr. Elsey's Ultra and Arm & Hammer Slide Platinum are the two names that come up most often in r/CatAdvice and r/litterrobot multi-cat threads. Both are explicitly marketed for multi-cat use and form dense clumps that hold together when scooped from a heavily used box.