Which Sims game is the best?

Definitely TS2. It is a huge step up from TS1, and has a lot of replay value and awesome features. It's the only game I actually bought the expansions for. TS3 isn't far behind, as I love the open world and Create-A-Style, but the shockingly low performance and the sheer amount of problems prevent this game from being as great as it could be. TS4 is honestly the worst Sims game I've ever played (after SimCity 2013, of course -_-). It's lacking in so many features we loved from the other sims games, and it's too focused on Young Adults and stupid trends. The Create-A-Sim changes didn't appeal to me, and the graphics don't improve the game one bit.