We stayed at CSR last February and loved it. I found the room decor to be the most attractive of the mods and of course the queen beds were great. I liked that the theming was more subdued, i.e. not in-your-face Disney everywhere. DD loved the water slide, we used the pool/spa every single day, we got lucky with 85 degree weather for a whole week in February! Although we would still swim every day even if it wasn't warm. I suspect there tend to be fewer young children at CSR than at CBR, but we did not feel out of place and our DD made friends in the pool pretty much every day. The only thing I didn't love was the food situation; I just didn't love the Pepper Market, I thought it was weird that they included a gratuity when they don't do anything and you are still eating cafeteria style. We loved CSR and would not hesitate to stay there again (preferably with a code/pin!).
That said, we are considering CBR for our next stay. I stayed there as a teen several times and have such fond memories. But I prefer the more sophisticated room decor and larger beds at CSR. I think DD would like the CBR pool, but I'm worried she won't go on the closed water slide (the open water slide at CSR was pretty much the highlight of her trip!). I also worry that CBR will be crazy with tons of kids everywhere. CSR pool was reasonably peaceful, even thought it was a busy week. I think I would prefer the CBR food court.