I won't express an opinion on who is more altruistic, [edit] because I don't think I have sufficient data to draw a broad conclusion. Studies on college campus like these always seem pretty weak to draw societal wide conclusions from. These tiny experiments are usually conducted on college students and often are not reproduce-able.

"In one of these experiments, the researchers, led by doctoral student Paul Piff, gave participants the opportunity to share $10 with an anonymous stranger. A few days earlier, the participants had all filled out a questionnaire in which they reported their socioeconomic status. The results showed that people who had placed themselves lower on the social scale were actually more generous than upper class participants were."

This strikes me as a pretty weak study to extrapolate to any society wide conclusions.