To give some perspective on the RC FLL pool, here is a fairly representative photograph that RC posted today on Facebook. NB, along the grass to the right of the pool is where the pool-side rooms are located. They have a bit of a green shield, but are not 'private' in the true sense of the word.
Inside, the FLL property is much better than the KB property. The outside is a coin toss, depending on what you want. KB - two pools and directly on the beach, and a much more private beach.
FLL has one, smaller, pool area, and you need to cross a busy road to get to a very nice, but fairly busy, beach. You can see the bridge on the left.
FLL you can walk to bars/restaurants (or drive to Las Olas). KB you'll be in a car or cab to go anywhere.