It depends on whether you're renting a condo/townhouse or a pool home I think. When we rent a pool home we very seldom go to the community pool, the grandkids just want to stay at "their" pool.
If you're renting a condo/townhouse and are depending on the community pool then Windsor Hills has a much bigger community pool with a water slide and a zero entry area and hot tub. There's also a pop-up fountain play area. The castle playground is nicer than the playground at Emerald Island also. WH has a mini movie theatre where you can reserve and watch a movie for free.
Emerald Island has a regular pool and hot tub with a tiki bar beside the pool. As far as distance goes they are only a few minutes apart.