I was on Zocor (simvastatin) for about 8 years, then 2 years ago my doctor switched me to Lipitor (atorvastatin) because he said that new clinical data showed that it was superior to Zocor. No problems with either one. My total cholesterol, LDL, HDL, and triglycerides numbers are good. But I need to add that I’ve also changed my diet, and I exercise regularly. YMMV