POR is much prettier in my opinion. Plus you can take a horse and carriage ride around the grounds, can you say romantic! On our last trip in June, we stayed at both, POR and CSR, we moved to CSR because my husband wanted to have a gym on premise. Well, we we're sorry we did move. CSR while nice, just does not have the same "charm" as POR. Also, remember the rooms at POR have all been recently refurbished and look so nice. (Especially the rooms in the Bayou section - we just loved our room there).
Our room at CSR looked very worn and the hallways in our building needed to be painted badly. I really found POR to be a much nicer, "fresh" feeling resort.
In any case, enjoy your trip!
Best,
Brando