We have stayed at both resorts and as far as the pools go, CBR wins with my family, hands down!
We've stayed at CBR twice and my boys still say CBR is one of their favorite pools on property. There are two water slides, zero entry, the theme is fun, there are two hot tubs, and the pirate ship water play area is tons of fun for kids. We love the tropical feel, the music, and the landscaping at this pool. We are going to WDW this summer and my kids asked if we could stay at CBR for a few nights because they "miss the pool". We'll be at CBR for 3 nights before heading to YC (another pool my kiddos love), and honestly, I'm as excited as the kids to go back to CBR. It's our summer "go to" resort, when we want to save a bit of money and stay at a moderate.
While I thought POR had a nice pool, there was nothing that stood out as "amazing" to us. It's just a nice pool, with a fun slide. My kids have never asked to go back to POR for the pool.