Wow! That answer could be a MILE long! Both are lush and lovely but there are some differences. Because OKW is a
DVC resort, the rooms range in size from studios, which are "like a regular hotel room" all the way up to grand villas, which sleep 12. Even the studios, however, have a kitchenette with fridge, microwave and toaster. OKW is very spread out, and there are 3 quiet pools plus the main pool. If you have a car, you park right in front of the individual building you stay in and have a nice balcony with view toward the back. There is an onsite store with basic groceries, two snack bars, and one full-service restaurant, Olivia's. The atmosphere is very relaxed and laid-back. OKW is peaceful and the rooms are known for their large size.
Carribean Beach (I hope that is what you mean by CRB) is the original "moderate." The rooms will have 2 fullsize beds (at OKW the beds are all queens or larger). The bathroom will be fairly tight, where at OKW it is quite large. Carribean Beach is also spread out in small groups of buildings around a central lake. There is a main center with a food court, shopping, and a small sit-down restaurant. The main pool has a slide. OKW is getting a slide, but at this point there is none.
Hope this helps. I love OKW and would be happy to answer other questions. You can PM me.