what is the best mitsuba render setting for best image ?

hi i need but the best render settings in mitsuba to get the best image qualty

For simple scenes(outdoor scenes, indoor scenes with big openings for the light to come in) you can use path or extended volumetric path with one of QMC samplers (halton, sobol or hammersley) or photomapper with irradiance cache activated and low discrepancy sampler. For more difficult scenes mostly use photomapper again and in rare cases pssmlt, mlt or erpt with independent sampler.