We stayed at both. CBR was our first on site stay. We were in Jamaica and loved it. Great location, nice beaches with hammocks

beautiful landscapping, good bus service. Really nothing we didn't like about CBR.
Then we decided to try POR, and is now our fav Moderate. Both are great resorts but POR has a bit more to offer IMO. Rooms are being newly refirbished with queens.
Boat to DTD, Horse & Carriage rides, evening entertainment in the lounge. Beautiful landscaping. I love strolling around the resort.
We've never had problems with busses at POR. We stay in the mansion section, and usually use that bus stop. Most of the time it's last to be picked up, and goes straight to the parks. Never found a problem with bus being full.
I think during peak morning times both POR & FQ run their own buses. And returning from the parks at night they have their own bus too.
I think the resorts are pretty similar in size. The diff. I think is at CBR they are around a lake you have to walk around to get to the main ammenities - food etc. Except for the bridge in the middle that goes from Jamaica/Aruba area to food & pool area. Also the Main Desk/Lobby is in a different area at CBR.
At POR the Lobby, Dining, Resort shop & lounge is all in the same area. Also being along the river, there are several bridges crossing over the river to get you where you want to go, so it's easier.