We started out using Feline Pine. Although there was no urine odor at all, once it got wet and broke down into sawdust, there was a marked wet pine sawdust odor which my husband didn't care for. Also that urine is actually staying in the box and not going anywhere since it's not scooped. Therefore It HAD to be emptied and refilled on a weekly basis. Contrary to what they say, the pellets will track somewhat. I found it hard to scoop also, possibly because I didn't have their "special" scoop that was not available in the store (PetsMart) and made do with one intended for crystals or pearls.
The WBCL, however, I can't say enough good about. It does have a corn odor, but I find it pleasant (reminds me of when I had chickens, LOL) it clumps hard and almost immediately. There is more to scoop since the urine clumps are being flushed as well, and if you are flushing them rather than trashing the waste it's a good idea to have a handy toilet brush to give the toilet just a quick touch-up. We keep the boxes fairly full and in, ummm, 3? months, have yet to feel a need to dump everything, scrub and re-fill. The waste never reaches the bottom of the pan and the boys are pretty good about going in the middle so it rarely gets on the sides as well. It is NOT good about eliminating fresh poo odors
, but I don't know a litter that is.
We are totally sold on WBCL.