I think you want to know the difference between Vistana Resort and Vistana Villages.
Vistana Resort is older, much bigger, 6 or 7 pools, maybe more.
Vistana Villages is newer, much smaller and adding on presently. We've stayed here and loved the 2BR villa. Excellent location, but there is only a deli/store, no restaurant on site when we were there.
Just returned from Grande Vista for the 2nd time. Loved it again.
I think you'd be happy at any of these, though I hear you should ask for a newly renovated room if you choose the Vistana RESORT.