We love them both! But for an anniversary, I would go for POR.
CBR is fun, bright, and really 'tropical' feeling. I love the hammocks on the beach. There are lot of boat activities, and the lake is gorgeous. THIS RESORT IS VERY BIG. If you choose to stay there, make sure to look at a map and make a room request that is near the main building. We stayed there 3 times and loved it as a kid.
POR is where I spent my honeymoon. It is more subtle, and laid-back. We loved the mansion section, very manicured and neat. It was very quiet. We loved the horsedrawn carriages roaming around, and the boat to dtd was a nice change of pace from the buses (it isnt faster but is more relaxing imho). While it doesnt have alot of 'disney' references like the all stars, it is beautiful and it was a great place to relax after a day at the parks.