Discover University. Largish world, adds plenty of realistic, everday careers, and well, the whole University aspect of it that it's sold on. Not that I've really done much with it. My Sim went straight into the engineering career in this save.
Strangerville is mostly sold (and the whole world revolves around) its storyline. The world is small, and not much can be done with it. I got tired of the storyline, and even with cheats, you can't bulldoze the lab and replace it with whatever you want. That's a shame, as it's such a big lot. I do like the Southwestern flair the world has. The pack, to an extent, along with Get Famous, I mark down as one of my biggest mistakes.