I'm booked at both for a split stay in Feb.
I chose CSR because it looked like it was as close to a Deluxe as you can get without the price. It has a spa, a health club, a great pool, a *club level* that no other mod offers at this time. I'm traveling with adults only, but this appealed to the vacation side of me- it looks like a Mexican vacation without leaving the country. (I feel like Poly was my Hawaiian vacation without leaving the mainland- so hoping this has the same vibe)
I love the parks- LOVE LOVE LOVE them- but I also like the idea of coming back to a resort to get away from it all. The biggest negative I could give was the possible lack of Disney feel since it is a convention resort- but depending on your preferences, that may not be a bad thing.
POR- I chose this because of the Royal room experience. It looks fantastic and so fun! Plus there are some rabid POR lovers who couldn't say enough about this resort and the CMs. I briefly visited the resort last year with a friend and thought it was nice- nothing wowed me, but nothing turned me off either. I lived in Savannah for a while, which is like a smaller, cleaner New Orleans, so the themeing of this resort reminds me of that. Which is lovely- but no longer exotic or interesting for me since I lived there!