Those are my two favorite resorts, really. CSR is a tiny bit more my style, and I wasn't expecting that from the website pics. Both restaurants are great imo (though Mayan Grill a bit better); I don't really love the counter service options at either place, but that's just *** I rarely like the counter service at the resorts. Pepper Market makes you tip, I think, too.
The pool at CBR is a bit more convenient to get to, and has the cool pirate ship theme, although the CSR pool is cool too. It just takes a bit to actually get to as it's clear across the property from the main building.
When there are conventions going on CSR tends to have a more business vibey feel which can be a bit awkward with kids, but it's not too bad.
CBR also has the island playground which is a nice touch. CSR doesn't have a playground, right?It's really a tossup.