Sims: Double Deluxe

The Sims: Double Deluxe product has been around for a few years now and brought hours of entertainment to myself when i played. It is essentially like the regular/original Sims, except with MANY extra items included to make each of your families, houses, and scenarios more unique. If even all this is not enough for you, there are websites where you can download extra things and then upload them to Sims (some sites even let you do this for free!)
I personally own many sims games, including Sims: Vacations, Sims: Pets, and Sims: Hot Date (or something along those lines). All of these add their own extra features. When you add one or more of these expansion packs to the regular Sims or Sims: Double Deluxe, it does make the game more enjoyable.
However, the game is a little out of date and there is the Sims 2, which has new expansion packs and tons of new and better features. If you're going to stick to the old version though, Sims: Double Deluxe is a lot better than regular Sims.

Note: In order to make an expansion pack work on your computer, regular Sims or Sims: Double Deluxe must be purchased and installed first.