Not All Clumping Is Created Equal
I'm going to compare Catsan Ultra, Golden White (Golden Grey brand), and Tigerino Nuggies.
None of them are perfect. The Catsan is expensive, the Golden White a little too powdery/scented. Nuggies combats the first two but lets itself down by its clumping power.
Value: excellent
Tracking: minimal compared to the others
Clumping: meh - you need great care - like playing 'Operation' such that you don't disrupt any pee-balls.
Golden wins for clumping. Nugs for tracking/value. One of the best.