Tickstory dukascopy tick data vs mql5 tick data backtest results

Benrashi Sagev Jacobson  

When this expert advisor was back-tested using tick-story dukascopy tick data with 100% tick modeling quality the profits were significantly higher compared to the

mql5 data with 100% tick modeling quality. My confusion is which back-test is accurate.

back-test Method: Every tick based on real ticks