Vistana Villages is a nice resort with a big pool (part of which is zero entry). The 2 bedroom villa is spacious with a tv in each bedroom as well as the livingroom. There are 2 bathrooms and there is a whirlpool tub in the master bedroom. The resort is located toward the south end of International Drive which is very quiet. It is close to everything if you are driving but not really within walking distance of anything (I'm thinking restaurants and shops). You do, however have the advantage of the I-Ride trolley which takes you anywhere along International Drive.
With 10 people to accomodate, however, why don't you look into renting a house. There are many near WDW and you can get a huge place (4,5,6 bedrooms) for an affordable price. Most of them have their own screened-in pool. This, IMO, would be a much more pleasant alternative to any of the places you mentioned. After all it is not even a question of on-site or off so why not go for space and comfort?