Poly is the best for transportation because you can take the bus, resort monorail, or small boat from the resort or you can take the ferry boat, express monorail, or Epcot monorail from the TTC.
Ditto. Poly is by far the best. I found the transportation at Disneyworld a big hassle. I am used to staying offsite at Disneyland and being able to walk to the front gate in 10 minutes.