Three great resorts
The biggest plus/minus factors for each from our family's point of view:
POR + great food court; good resort store; lovely resort ambience; boat to DTD; carriage rides; lovely landscaping
- no lifts, but only two levels
OKW + large rooms with balcony; fridge, toaster and microwave make it easy to prepare some in-room breakfasts and snacks if that's what you want; store sells some grocery supplies; boat to DTD; lovely landscaping; laid-back feel
- dense foliage may obscure any balcony view; some rooms quite far from main building; limited fast-food/cs meals; no lifts in most buildings, even those with four levels - although Bell Services will always help with luggage
SSR + balconies on all rooms; rooms with fridge,toaster and microwave make it easy to prepare some in-room breakfasts and snacks if that's what you want; store sells some grocery supplies; easy walk to DTD (with easy connection to buses to other resorts);
- some rooms quite far from main building; landscaping more open and less mature than the other two resorts
Another factor may be (depending on your party size) that SSR has one queen bed and a sofa bed, so you'll have a small sitting area if you don't need the second bed made up.
I'm sure there are more but, basically, it's down to personal preference, and what suits our family may not suit yours so well
Also, we are going in October - how is the weather likely to be? Previously we have only visited in July? 
Found the pool better and different food selection.
It's a while since we stayed there, so my memory must be playing tricks!
