Usually, a MOSFET is used in power supplies more efficiently because the working of MOSFET is faster due to metal oxide usage apart from BJT. Here, BJT depends on the combination of electron-hole.
MOSFET works with low power once switching at high frequency because it has a quick switching speed so it leads through grid-oxide controlled field-effect but not through the recombination of an electron or hole like BJT. In MOSFET, the circuit like gate control is very simpler