
I'm not sure there is any single "best resort for disabilities" at WDW. Each has pros and cons, which are most important to your family may depend on many factors. In mid-July, most resorts will be fairly busy for summer season and near-full.
The monorail resorts are closest to MK, via monorail or boat (Poly and GF) or a walking path (CR). There is also fairly easy access to EPCOT via monorail from these resorts as well.
WL is also near MK, but not on the monorail and involves a boat ride. Buses are used to all other parks.
If you expect to spend more time at EPCOT, you might consider a resort in that area -- BC, YC or BWI. Easy walking or boat ride to EPCOT and also DHS; buses to MK and AK.
Moderate resorts use buses to all parks. POFQ is a fairly small (compact) resort and preferred by many for it's size compared to other more sprawling moderates.
Value resorts also use buses to all parks. If you plan to spend most of your time at the parks, with very little resort time, some like the values to save money that can be spent elsewhere at WDW.
In your situation, I'd consider 1) what park(s) you'll be visiting, 2) how much time spent at the resort and/or back-and-forth to the resort, 3) preferred mode of transportation (will your DH be using an
ECV or wheelchair). Once you decide on resort, then consider whether there is a category of room that might make your stay easier -- "preferred" rooms typically are closest to the main building, restaurant(s), feature pool, transportation, etc.
Enjoy your vacation!
ETA: moving to the main disABILITIES forum so more people will see and provide input.