I've only ever used the SF-3 myself. Randall Munroe studied physics, so I'm impressed with his familiarity with social science datasets.
Fun fact I did not know until today - Munroe graduated from Christopher Newport University the same year I graduated from William and Mary. CNU is just a few miles down the road from W&M. My cousin went there, and Kate did a lot of joint stuff with the school's sister chapter of her sorority (Phi Mu).