I already have Operation Anchorage, Point Lookout, and the best in my opinion, Broken Steel. The question is which one (if any at all) should I purchase next.
THe only reason i voted Zeta is because the Mothership Zeta Crew mod is based off of it and it is used in more mods than The Pitt. So if your on PC get Zeta if not then get The Pitt.
Mothership Zeta and Operation Ancorage were dumb. The Pitt was the only time I enjoyed Fallout 3, and is the only moment when Fallout 3 felt like a true RPG experience.