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Both IGBT and MOSFET are the best as per application.I am designing high efficiency grid inverter for PV with dual buck topology for 300 watt system. During my simulation I saw that the body diode of two Mosfet switches getting turning on and this switches running on grid frequency (50 Hz). And other two Mosfet's body diode of the inverter are silent during operations. And that is running at PWM frequency. One option I feel that I could replace igbt that will switch on grid frequency or else in the mosfet switch I could put an inductor to avoid the diode getting turning on. but if choose igbt i will get high on state losses compare to mosfet due to small current I= 1.30 rms and mosfet fits for that.