Because of it's proximity to MK and the number of days you want to tour there, I would choose CR. We loved our stay and it's my kids' favorite, so far, even over Poly CL. We didn't use the pool at all, so I can't comment on that.
Reasons I'd choose it:
---Close to MK, the park you plan to visit the most
---Everything is in one building. You're going during hurricane season and there will likely be a fair amount of rain whether hurricanes/tropical storms are imminent, or not. Walking between Poly buildings in a downpour is not something I want to have to repeat over the course of my vacation!
---Good to great dining options.
---Some of the largest rooms on property. We're also a family of 5 and had plenty of room.
---Buses were just fine for us during our January '14 trip.
Poly
---large rooms
---beautiful grounds and pool areas
---good dining options
---during storms, boat transportation will be suspended and walking to TTC will be unpleasant. Walking in the rain to the main building or QS won't be fun more than once

, let alone to the bus stop.
We're wanting to stay in the Epcot resort area next summer because we plan on visiting that park in the evenings and my kids would love SAB. The smaller rooms are a bit of a concern, but I know we'll manage ok. It won't make or break our vacation. I'd really consider switching to a monorail resort if I lucked into a cheaper rate, though.
Edit Temps: in the 90s with a "feels like" temp of sauna. Be sure to drink water whenever the opportunity presents itself, and free filtered is available at QS. Just ask for a cup of ice water. We drank it constantly, even in the cooler months.