I have stayed at both and LOVE both! They are very different in feel, each with a unique theme. Depending on where your room is, at either resort, you could either have a short or very long walk to the main areas.
We have stayed at POR a number of times and love it. It has a beautiful reception area where you check in, Boatwright's table service restaurant (which we LOVE), River Roost lounge which features the amazing Bob Jackson on Wed through Sat nights, and Riverside Mill which is IMO one of the best counter service areas on property... lots of tables, a variety of food offerings, beautiful views of the river, etc. The walkways in between buildings are lush and winding (and can be confusing, especially at first). The walk around the resort which follows the Sassagoula River is beautiful! It is about a 10 min walk to POFQ, where you can get beignets!

You can also catch the boat to DTD, which is a major plus for us.
CBR is a beautiful resort, with all the buildings set around a lake. We have stayed there twice in this past year (Oct '14 and Feb '15) and loved the newly refurbished rooms (stay in Jamaica, if you can.) The walk across to Centertown (counter service, shop, mug refills, etc.) from Jamiaca or Aruba across the Caribbean Cay bridge is the shortest from a standard room. There is beautiful landscaping all over the resort. We loved the beautiful quiet pool at Jamaica, and each of the six villages has its own beach. The lights reflect off the water at night and you can walk around the resort on a walkway that hugs the water's edge. The main pool has a pirate theme, and although we never swam it never looked very crowded. One thing I absolutely love about the refurbished rooms are the ample outlets and USB charging stations in the new furniture. Check out the CBR FAQ thread here (lots of great pics):
http://www.disboards.com/threads/th...ort-faq-thread-part-viii-updated-4-7.3348628/
and YES the murphy beds are the same size in each. However, the actual rooms in CBR are slightly larger than the rooms at POR AB (the only rooms at POR w/ Murphy beds.)