Simvastatin (generic zocor) or the generic for lipitor (atorvastatin)? What is the difference?

Statins. The milligram for milligram potency of Lipitor (atorvastatin) is higher than that for simvastatin. There is some difference in the incidence of side effects but clinically these are not seen very often. Since Lipitor (atorvastatin) became generic it has become more popular. Rosuvastatin(crestor) not generic so expensive has become very popular tho' why given its cost/pill relative to the others is debatable.
Both are statins. to treat cholesterol but different chemicals. Lipitor (atorvastatin) is mg/ mg stronger than zocor.