The Dig Site pool at the Coronado Springs Resort is great. The Jaguar slide is the best. The pool is large and never found it to be too crowded. If you are there in the morning, the CMs do a ceremony with the kids where they call the water god to start the flow down the pyramid. There are also pool games for the kids everyday and a marshmallow roast and movies in the evening.
The pool at CBR is also good although we have not stayed there. It is pirate themed. I would believe that CBR has all of the activities like the other Mods. We are partial to CSR.
I would say CBR. But know that for the adults, CBR is the only moderate that still has double beds instead of queen sized beds. If bed size is important to you, CSR also has a great pool and queen sized beds too.