Well, we've stayed at both and they are totally different. I'll try to help as much as I can...
Our YC stay was an "adult only" stay....and our POR stay has been and will be (this week) with children.
(Pros and Cons)
YC - (pros) location on the Boardwalk, eating at Beaches and Cream (located between the Yacht and Beach Club), being able to walk to Epcot and of course, Storm Along Bay. (cons) - kind of a "stuffy" atmosphere, a very long walk from our room to the pool area - even though our room overlooked Storm Along Bay, this resort definately has a "hotel" feel.
POR - (pros) the boat ride to DTD, the beauty of the grounds (just can't be beat), the secluded feel of the bayou area (our favorite). I personally enjoyed this area much better than the "hotel" feel of the YC and I felt we had just as long of a walk to the lobby and pool at the YC as we did at POR. Another plus (especially if you're traveling with children) is the food court. There is no food court at the YC and those sit-down meals will really add up quickly. The convenience of the food court is a must (in my opinion) when you're traveling with children.
Hope this helps....both are wonderful resorts!!! If it were just DH and myself, I'd return to the YC. I know my kids would love the pool area there, but the convenience of POR wins out for us if you have kids.