I took Simvastatin for several years with no side effects, then I started to get muscle pains and cramps. These disappeared when I stopped taking it. Then I tried Atorvastatin which was better - no cramps, but I still got muscle aches. Now I'm on Pravastatin which doesn't seem too bad.
If you get muscle aches from the lipid soluble statins (Simvastatin, Atorvastatin and others), then the water soluble statins are supposedly better (Pravastatin, Rosuvastatin).