Paul F. answered 07/05/19
Highly Experienced Physics, SAT Math and Calculus Tutor
BJT can switch faster than a MOSFET due to less capacitance at the control pin.
The basic JFET has a diode like input. ... So, the reverse biased gate input of the FET is the cause of its high input impedance.However a MOSFET is more tolerant to heat (stable amid thermal changes) and can simulate a good resistor.