Both Grande Vista and Cypress Harbour are topnotch Marriott timeshare resorts in Orlando. Which is better is probably a matter of what is important to the individual. GV is a somewhat newer, fairly large resort with direct access to a Marriott golf course on the property, has some limited spa-type services and has an on-site restaurant. CH is smaller, cozier and seems more laid back. Older units at both resorts have either recently undergone interior renovation or are currently being refurbished.
In my opinion, either of these resorts would be a very good choice.
Dick Taylor