Hi Chris,
With the new FTMO app it is no longer necessary to test the Expert Advisors as the app does this for you.
I would suggest trying different strategies to see which one works for you. Sometimes Petko will use just one Expert Advisor to complete an FTMO Challenge and sometimes he will use three.
I would suggest using the Expert Advisors in a FREE FTMO demo account until you are comfortable with a successful strategy.
Alan,