Vso Best — Fpstate

Most retail backtesters fail because they only test current stocks or forex pairs. FPState forces you to handle delisted instruments. If you are building a long-term equity strategy, VSO will show you beautiful returns on Apple and Microsoft; FPState will show you the disaster that happened when you held Enron or Bear Stearns.

VSO does standard optimization (find best parameters for past data). FPState excels at Walk-Forward Analysis—optimizing on an in-sample period and validating on an out-of-sample period. This is the gold standard for preventing curve-fitting. fpstate vso best

Verdict: SO BEST wins for reliability. Unless you know the specific batch heat treat numbers from FPSTATE, C158 is the safer bet. Most retail backtesters fail because they only test