I've stayed at all four moderates and would definitely choose CSR over CBR. CSR has the best bus service of any WDW resort. It has the biggest hot tub on property, newly refurbished rooms with very comfortable queen size beds, lovely fountains in the Casitas and white sand beaches with hammocks in the Cabanas. I am not a fan of the Rancho section however. But that's just because I'm from Texas and don't care for the theme or how far it is from the main building.
I love the Maya Grill, Pepper Market, and even Cafe Rix is pretty good. I like how you can refill your mugs at Cafe Rix, Pepper Market, or the pool bar. It is the only moderate to have a health club/spa. Your kids will love the pool and longer pool slide.
In October I'm giving CBR another try, but when I was there several years ago mousekeeping was REALLY bad, as was the bus service. I was not impressed with either the food court or their TS restaurant (Shutters). The new pool looks really nice though and the rooms at CBR are just a tad bigger than the other moderates.