POR Riverside! I've stayed at both, and there are no bad choices. But my pref is The mansions at POR.
All the mansions are along the river. Beautiful landscaping. I find it so peaceful strolling along the river paths.
Most buildings at POFQ are set back from the river, so unless you have a river view or are getting on the boat, or make a point of walking down to the river you never see it. I
I prefer the quick service restaurant at Riverside, and they have a great evening ententsiner in the evenings at River Roost. Also love seeing the horse & carridges and boats go by. As I mentioned, at POFQ you're a little removed unless in a river view room.
One other thing I prefer at POR is that they have quiet pools. I have adult children and don't always want to be at the main pool. Especially during the afternoon pool party. Many times I just want to relax on a lounge with a book, and have a quiet float in the pool. Sometimes I enjoy the main pool, get a drink and enjoy the hot tub.