We recently stayed off site WDW for four days (Marriott Harbour Lake) and onsite UOR Cabana bay for four days. I am sure there are a few threads regarding this topic you could search for and there will be many that post for staying in the “bubble” at WDW…here is a link to a “stay on or off property-that is the question”.
You can find my more detailed opinion/experience from a recent trip there. Hope you enjoy the planning phase and have great trip!