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They have very high input impedance.
This means they have very high gain.
They have less problem with charge storage.
This means they have wider bandwidth and higher switching speeds.
Their current is inversely proportional to temperature.
This means no thermal runaway problems.
for the bipolar transistors, they r known as current contol current sourse...as u can control them by entering a base current...bur for the mosfets...they are voltage control current sourse..that u control them by voltage only and they dont drow any current..so they have a very large impedance better than the bipolar ones....but the switching time of the bipolar is much better than mosfets
The word "better" takes on many meanings and this is especially true in electronics. While some technologies have significant advantages over others there are very few that are "all purpose" in the sense that they do all the things that need to be done better than anything else. Each type of device here is different and while some may appear to have many "ideal" characteristics each of them also "suffers" in one way or another and is less suited for some applications.