As the owner of ORATS I can speak to the benefits of our backtester:
Near end of day data back to 2007 with excellent greeks and theoretical values.
Highly customizable backtests including the ability to select from many traditional options strategies, overlay with stock, change leg relationships, set price levels, set delta or OTM% levels.
Exit strategies including stop loss, stop profit%, delta level, percentage of strike difference.
View results with Sharpe ratios, win%, see all trades and download CSVs.
Ability to combine backtests in different weightings.
Ability to run multiple symbols.
Ability to enter based on indicators like volatility levels or IV/HV.
Ability to use outside entry and exit dates.
Ability to trade around earnings and investor conferences.
Many more.
