Best overall: VV3, because of the chief and the large construction projects.
Favorite to Play: VV4, because I like the layout and the experience of playing it.
Best Graphics: VV4, the people and buildings are crisp and well drawn.
Hardest to play: VV2, because of the algae and just getting started.
Most improved: VV3, because I didn't really like the gameplay or graphics of VV2.
If I could only buy one: VV3, because of how long it takes for me to complete it, so I would have lots to do.