They both work, but if you're a stickler for terrain, the scenarios are very different, almost needing a new set of terrain for each scenario.
fwiw, I have the unreleased Lasting Tales miniatures skirmish game, and, even though it has 20-some scenarios, the Wilderness and Settlement terrain overlap. (Just add buildings for the village. Thematically, the Dungeon scenarios need their own terrain, though, and RPG dungeon game tiles didn't work out.)