I love them both and from my standpoint, you cannot make a bad choice! CBR is my favorite moderate, I love the Caribbean theme, the different villages, love having the food court next to the main pool and the rooms are just a tad bigger. I didn't find one more spread out than the other. CSR has golf carts that circulate to take you around and CBR has a very reliable internal bus system. But honestly, neither resort for me felt too big to naviagate. And given the beauty of both resorts and their lakes and landscaping, its not torture to walk a bit as long as you don't have mobility issues or small children with no strollers. One nice thing about CBR, its the only moderate with preferred location (not to be confused with the preferred views it and other mods have). That way you can be assured to be near the main areas.
If a main pool with a large slide and hottub is very important to you, and your dates fall before the pool rehab is set to be done, I would say definitely go with CSR. It has a fantastic pool. However, the quiet pools at CBR are wonderful (the nicest I have seen at any mod) and two of them have smaller scale slides during this pool rehab. I loved the quiet pools at CBR and in fact, we didnt' use the main pool as much as I would have thought we might have.
I like that at CBR you can see Illuminations from around the resort and agree with KatMark that CSR is very lovely at night as well.