This FAQ outlines the differences between the various editions of The Division 2. The Warlords version will come with the DLC expansion and level 30 boost if you want to get into the endgame early on, while the base game will only include the DC campaign.
Naturally if you purchase the base game and find yourself wanting for more, you can always buy the DLC later on! If you have any other questions regarding the editions, feel free to ask. :)