Ive stayed at both resorts (CSR and PO-FQ) so I can comment on them from personal experience.
First off, we enjoyed both. I dont think youll make a mistake by choosing one over the other. Each resort has its pros and cons, but there are a couple of key things I would consider to decide between them.
Whom are you traveling with? If you have no children, then my next comments wont apply. Both resorts have wonderful pool areas, but I think the pool area at the CSR is better suited to adults and older children, whereas the PO-FQ pool is better for younger kids. CSR has a fantastic water slide thats as good as most youll find in a water park. However, the slide at PO-FQ is ideal for small children (say under 7), but lame for older kids and adults.
Both resorts have a nice transportation feature. At PO-FQ its the boat to/from Downtown Disneya pleasurable ride. At CSR, its direct bus service to/from the Boardwalk. (BTW, I read a post here about that bus no longer exists. That post is erroneous. The CSR bus has always been CSR to Boardwalk to Downtown, then Downtown to Boardwalk to CSR on the return.) So my point is that you should consider where youll spend more timeat Downtown (better for PO-FQ) or the Boardwalk/Epcot (better for CSR).
Personally, we disliked the CSR food court. However, we were there within a few months of the resorts opening, and Ive been reading better reviews about it lately, so I believe it may have improved. I think PO-FQs main quality is its smallness. Everything (food court, pool, bar, bus stop, bus transportation) is close to your room. Whereas if you wind up in the Ranchos at CSR, youre kind of in East Jybip.
Like I said, though, I think youll be happy with either resort. Theyre both delightful and beautiful. Happy trip planning and feel free to ask any questions.