Running with fresh air will increase condensation on the evaporator. When in recirculation mode, the dehumidified air inside the cabin is continuously cycled through the evaporator. Due to the existing dehumidification, there is less moisture to extract, resulting in the evaporator remaining mostly dry.
Fresh air will draw the humid external air through the evaporator, where it will collect moisture, rendering it saturated. To determine which option generates more water, do a 15-minute journey in the early morning, when humidity is highest, with the recirculation setting activated, and observe the volume of water discharged from the HVAC drain. Subsequently, repeat the ride in fresh air and observe the volume of water being discharged.