The amp design is the critical factor to a greater degree than transistor type. I have used both, have both now. One advantage of mosfets is that they can handle more power per pair. The GamuT amps only use one pair for 200 watts, some can handle 500 watts a pair. They are generally more rugged also. Driving low impedences will depend more on the circuit design than anything else. All things being equal I think I would rather have mosfets but they are seldom equal. The CJ 350 uses FETs but I am not sure exactly which and it is very good.
