I agree it sort of depends what you want.
POR - my last favorite: boring pool, boring food court -but is an All American theme if you like that. nice boat ride, access to POFQ/DTD, horses
CBR- best pool, very sprawling, decent food court, biggest rooms- but the oldest of the three resorts, lots of lush landscaping
CSR- Best food- if you like Mexican and will have the dining plan. (You get semi-TS meals for a QS credit in PM), also the option of grab and go, nice adult lounge, nice pool theme, ONLY mod with queen sized beds, also quite large resort
I think some room interiors have been renovated since last I stayed, so it would be unfair for me to comment on room interiors. Most recently, we've mostly bee opting for values or deluxes. All of the mods have slow transportation to the parks (because the buses make so many stops, and tend to always be full)