This post is still open so I would like to submit my comment:
VV1 - made me hooked to this ldw thing in the first place
VV2 - awsome game, soo much better them VV1 in graphs and possibilities, my only irritation -if there was any- where the docters who got stuck nearby the dam, so stayed there for hours walking in circles, if you did not put them on track again ...

Plant Tycoon also is very addicting and you can play it in many different ways, you can plan your day on it
Fish Tycoon also is nice, my problem was that I did not want to sell those pretty fish, but had to cause there was no room for them if I wanted to solve the puzzle ...

That's why my vote goes to (drums :D) .... VV3, although the builders won't repair huts to build their skills in the end, which is a bit sad in this merely perfect game.

VF is not on the list but if it was my vote would still be VV3
I hope there's many more games in stock for us!!