gypsy,
Welcome to the DIS.
I can really speak about POR, but I plan to visit CBR next trip in Dec.
As they are both moderate resorts, they have a lot of the same amenities: big pool, quiet pools, bike rental, boat rental, food court, one sit down restaurant, multiple bus stops.
The differences probably come down to:
Theming:
CBR beachy tropical with sand beaches
POR: old south with beautiful landscaping, rustic bayou look or grand mansion look
CBR is a little larger, and is considered an Epcot resort. You can see Illuminations from the beach
POR is a Downtown disney resort and has the boat to DTD which is a free nice relaxing ride if you will be spending time at DTD
Rooms:
POR can sleep 5 in the bayous, with a trundle bed
CBR has nice privacy curtain separating the sink area from the beds.
I think they probably both have same amount of kids/families.
POR also has Bob Jackson. He is the piano player in the River Roost Lounge who is great. He is very entertaining for both kids and adults. I do not think CBR has a lounge. (although it has an outdoor pool bar as does POR)
We really enjoyed POR, but we are also really looking forward to CBR.