You realistically cannot compare power levels either. One is tuned for powering around a 2500lb car whilst maintaining reliability, the other is tuned for powering around an 8000lb brick + its rated towing capacity without burning down the house from excessive EGTs etc. Tune the duramax for the same max weight as the tdi and see which makes more power. This is why the durmax picks up so much power on a tuner alone, they’re detuned so they stay together while being a workhorse. this is also why a tdi only picks up 20-40hp max from a tune.