There are many traders that beliеve that when OOS is on the Generator produces more robust strategies. This is because it uses part of the data series for "training" the strategy and the rest of the data for "trading" simulation. I personally cannot neither confirm nor deny this.

Regarding the Optimizer, there is no correct answer here also. It adjusts the indicator parameters in order to improve performance but this may lead to curve fitting. No matter you use it or not, you have to check you strategies with Monte Carlo.

FSB Pro comes with powerful tools but you must use them properly and carefully.

The best test....... is to run the strategy in a demo account for a good long period of time and then using small lots on a real account.

I have done many kinds of testing prior to attaching to a chart....... sometimes it works well and sometimes not so good.

The real test is from live data on a real account.

My thinking is that the market can change over time, we have to observe those changes in order to know if the strategy will work.