I started playing with SimCity eons ago and eventually got bored because it became too easy. I watched the various versions of Sims 1-3 come out but didn't get any of the games until March 2011 when I had some down time and decided to give it a try.
For me it is more about building and renovating the buildings than the Sims, but I play the Sims to see how they live in my building renovations.
Still a lot to learn, but I like the variety the game provides.