If you like turn based RPGs and haven't played any Darkest Dungeon game, then get and play the first Darkest Dungeon.

If you've played the first game and enjoyed the combat mechanics, then get DD2. This game is like a distillation of the combat. It has less story and other elements. I enjoyed the first Darkest Dungeon more overall, but I enjoy playing DD2 more as a game.

145 hours playtime before killing the final boss.

If you like turn based RPGs and haven't played any Darkest Dungeon game, then get and play the first Darkest Dungeon. If you've played the first game and enjoyed the combat mechanics, then get DD2. This game is like a distillation of the combat. It has less story and other elements. I enjoyed the first Darkest Dungeon more overall, but I enjoy playing DD2 more as a game. 145 hours playtime before killing the final boss.