Cody uses WBCL..However once this bag finishes he will be uses the wood pellets as this is what my big boys use and cody had it for a week when my wbcl ran out and he was fine with it. I was very impressed with the odour control which i'd say is as good as wbcl. The thing with wb is you have it really deep and as it is superb clumping you remove the clumps as and when, however as the tray gets less deep (getting towards the time you empty it all out and clean properly) i think it starts to very slightly smell..not too bad and it is really just since cody has been an adult i've noticed this.
Perhaps because you have to empty and clean the whole tray more often with the pellets this doesnt happen but its much cheaper and you can afford to waste some by chucking out,
I suppose cost is why i am changing but i would still highly recommend the wbcl as it really is good and fantastic clumping which i miss with the pellets but as i say you can use it sparingly as it expands into sawdust and emtpy the tray every day for cleaning.