advice: what is the best Tiller game?

[Mr Grumpy]

Also when you make your selection, keep your first scenarios small until you fully understand the game system, many new players try to run before they can walk and that often leads to frustration. ;)

I also forgot to say that there are no "old" titles in the series, the older titles are updated with new features to the same level as the latest ones, so don't feel you have to pick the titles most recently released. ;)