RE: Flaps....to flip or twist
The switch is a lot more reliable in that you can feel the setting quite easily without taking your eyes off the plane.
With the rotary dial it is unfortunately quite easy to have a little flap dialed in and not know it. Setting partial flaps for takeoff is not easy, and getting full flaps smoothly wasn't easy.
The 3 position switch can be setup exactly and it's fast and accurately repeatable. It's as easy to set as any trim setting. I don't ever use the dials any more.