I agree that twist grip always feels best for the pilot. Many moons ago I used to fly Robinsons. The combination of the twist grip and the responsive engine allowed you to exercise really good control, almost feeling it onto the ground (as an in-practice instructor). My recent types EC135/MD902 also have twist grips x 2. Bit more of a handful, although you can always do one at a time. The mechanisms and engine responses are more difficult than single piston engine though. OK for in-flight shutdown, but trying to finesse TR control failures would be interesting.