WPRESIDENCE and WPESTATE are different themes. We support both themes.
WPRESIDENCE license has to be purchased separately if you wish to use that. But you can easily decide to make the switch in the future. Since you have already worked so hard on WPESTATE, I don’t see why you would have to give it up now.
We plan to add new features to both themes. It’s normal each has something different, but both work equally well.