Sims 2 - Made to make music videos/videos and more easier to use. The Sims look more skinnier and normal.
Sims 3 - More of a reality type of game. It looks really realistic. But I wouldn't consider it to use for making videos. Also the Sims look a little more chunkier and weird. If you realize it, when you see Sims in the Sims 3, they all look alike each other from there faces.