Sims Nightlife! Or was that Sims 2?
I find the character development to be better in Sims 3, but I find it to be too tedious sometimes. I was wildly addicted to Sims 2, I loved the Nightlife and Business packs.
For Sims 3 I liked World Adventures, although there are a few very annoying bugs (like the quest message board). I could spend hours exploring 1 crypt or tomb!