Starflex
2 blade tailrotor, lots of bite and very powerful
4 bladed maybe quiet but very expensive, not so much bite, engine off landings need a load more pedal as authority is not as good
Notar hm difficult to describe, put an input in and then wait for about 2 seconds for a response. In laymans terms think of it like the clutch in the car. Just before service the clutch travels along way to get the bite ( Notar)
Take car to garage, they adjust clutch / put new one in. Clutch now appears to be more like an on off switch than before ( 2 blade tailrotor)
Personally I would have the 2 bladed tail rotor everytime.