Played, enjoyed and recommend Sunless Citadel. A dungeon crawl with enough twists and personality to be entertaining. Made with new players in mind, so its easy to DM.
Am playing Death in Freeport right now; a much more talky adventure. And shorter to boot. Its still fun, but it requires a lot more DM effort.
If your party enjoys slaying monsters or your DM is not extremely good, go with the Citadel. If your DM is quick on his feet and your group wants to role-play a lot, try Freeport.