Where both CO2 and H2S present in the gas streams, Amines are still the best choice, with the help of amine CO2 can be reduced to less than 2%. In case of H2S MDEA is much better choice, because it seletively remove H2S. I feel some propritary MDEA (Dow/Huntsman/BASF) will work best and can remove both pollutant to desired level effectively.