I have a couple OS and like them. I find them slightly (very slightly) more reliable than my fuzzibunz leak-wise although both are very good.
I like how the CB have a flap in the front that holds the insert in place. The insert are also slightly easier to stuff inside because the diapers are wider.
The only downside I've found to the CB is that they didn't fit right away because of the wider crotch area. They really splayed his legs out weird. For that reason I used my FB exclusively until the last couple weeks. Every baby is different size-wise though so it may not be an issue for you
The main reason I bought mostly FB is because of warranty - they have lifetime warranty on the snaps and on pul defects. The diapers are otherwise very comparable.