I stayed at both within the past year. Pop is better for bus service by far, and is more compact so easier to get to the main building. We would pass through to fill our water bottles in the food court on our way to the bus stop every morning, no need to buy bottled water. Room is a bit smaller but newly refurbished. I liked the bathroom better at Pop. There wasn’t a table with both beds down, but there is a long bureau you can set things on.
CBR has a better pool and has a hot tub. The main building also got crowded and loud, on the rare occasion we were there. It was a hike from our room so we only ventured there a couple of times in the week we were there. The rooms were ok but could use refurbishment again soon. They still have carpet which is pretty dirty. If you aren’t at the beginning of the bus loop be prepared to be passed by by full busses. The TS is supposed to be good at CBR, it’s still on my bucket list. You can get a room for 5 at CBR due to the fold-down beds but I’m not sure an adult would be very comfortable on it. Or a small child, too easy to roll off.
We plan to stay at both later this year again since we need a room for 5 on one trip. On the whole however for the price difference I would go for Pop, unless you plan on lots of pool time.