Summer Bay has several resort areas - Houses at Summer Bay (supposedly fantastic), Villas at Summer Bay (small rooms, terrible reviews) and Summer Bay Resort (quite mixed reviews in terms of maint & uncomfortable beds) - as well as a hotel (poor reviews) where they house touring sales pitch guests. If you are going during cooler weather, the lake water at SB is cool and the kiddie water features are not heated. But many families enjoy these amenities during the warmer weather months. If you get a room in a 2-story building, walking up to a 2nd floor unit is no fun with a tired toddler, stroller & gear. The taller buildings have elevators.
We really enjoy the Wyndham Cypress Palms resort. It suits our needs since we like a walkable resort that's close to the parks, close to restaurants, with nice rooms and well-heated pools. The buildings are all 4-5 stories with elevators. The 2BR condos are very comfortable and spacious, with all the nicer amenities - very home-like. The playground is covered with shade from the summer sun. If you stay there, call the week before and request a recently refurbished room - about half the rooms have been redone so far and it looks great. Best of all, we've had excellent experiences with the staff - helpful and friendly.
I've driven to both of these resorts from Disney and Summer Bay is about 5-10 minutes further from Animal Kingdom (using the Black Lake to Sherberth shortcut) than Wyndham Cypress Palms. But when driving to all the other Disney parks, Summer Bay is at least 10-15 minutes further away, IMHO. Overall, the two resorts offer similar amenities except for the lake at Summer Bay, which isn't of use with an 18 month old toddler.
Westgate Vacation Villas, Silver Lake Resort and Orbit One Vacation Villas are all similarly close to the parks, a few minutes closer than Wyn CP. These are all decent places to stay if you don't have a better choice but would not win out over either Wyn CP or SB. HTH.
