Hi, have stayed in both and live in Sunset Lakes 3 months in the winter.
Both great choices for location and reputation for nice homes. SL is smaller community with homes around a huge oval lake. There is a gated entrance with a code to get in. Homes are a little older than IC.
Both great location to get to Disney.
I would look at amenities like game room, king beds, hot tub and pool, and then look at price and see what fits your needs. Both come highly rated by most folks. In my opinion, SL will be much more like a small neighborhood and IC more like a big housing developement. SL has about 3 streets only and IC will have many more turns, streets, and homes.
Good Luck...Ted