Base game vs Timber, new players

[peoplebacon]

Hey all, I have a question for the more experienced players here. I have a gaming group that wants to try lnoe. My question is, do I purchase the base game, or the timber stand alone? I may buy more in the future, but that's not for sure yet. This decision should be based solely on gameplay, not "buy the base game because its part 1 of the story." Thanks for any input in advance.