It would be one in which assimilates atmospheric CO2 plant with minimal water loss, due to the opening of the stomata. The plant search the balance between output water vapor and CO2 input without negatively affecting the maintenance of their metabolic processes. Some tropical grasses maintain the turgor of the cells by osmotic adjustment (solute retention) which enables a reduction in stomatal resistance, allowing the CO2 input while the transpiration losses are minimal.
It depends on kind of plant. C4 plant show lower stomatal conductance compared with C4 while maintaining higher photosynthesis rate due to CO2 concentrating mechanism.
Apart from type of the plant, environmental conditions are also important to find the optimal stomatal conductance. As a nice example growing plants in moderate and low VPDs would result in similar net photosynthesis rate while the stomatal conductance of low VPD-grown plant is much higher than the moderate VPD-grown plant. This means that the plant which grown in low VPD has just extra stomatal conductance. This would result in many problems such as increase in disease infection rate and also water conservation problem due to decreased stomatal functionality.
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