Honestly I really think it depends on what the both of you like. Whats romantic to one couple is not romantic at all to others. Like to my DH and I, when I took him to look at the POR and POFQ he really hated them, but when I took him to the CB he kept talking about how we definitely needed to honeymoon there. (Until he looked at pictures of the AKL and wound up torn b/w the two.)
What do you think you would like better? A river, a lake, a mardi-gras themed atmosphere, a caribbean atmosphere, etc.
If it helps Ill explain why my DH and I found the CB more romantic. At the CB walking around under the lights and around the lake at night is wonderful. You can hear the crickets chirping and it seems practically deserted. Even in peak season we've never had a problem finding a hammock in the early evening hours, and just relaxing on their small beach right by their food court is fantastic. Add the quiet pools to that (we've always found them virtually empty except for the ducks that like to fly in to join us there) and the tree lined walkways with little lizards running to and fro and that was for us.
The POR and POFQ are a bit busier to me, b/c they are less spread out. I think thats what my husband and I preferred about the CB, it was more spread out than any of the other resorts. That however, seems to be a downside of the CB to most people. If you don't like spread out things you probably would not enjoy the CB as much. Of course how spread out it is I've noticed is a matter of opinion. I think its more spread out, but it's still not a bad walk by any means.
Best of luck in your search. Have you tried just looking at pictures of all 4 resorts and seeing what you liked the best?