[Spiros]

As mere lad of 76 I offer my opinion with all due respect.

In the early 60's I used the standard wee Scalextric box with a thumb plunger. When 1/24 commercial raceways opened, I took up a Cox, a Towerstat, a Champion, and then an MRC (all thumb operated). My first experience with a Russkit trigger style (later to be the Parma) was very illuminating. I was faster the minute I changed from the MRC to the Russkit. I also found that the rather uncomfortable heat  generated by the resistor in the plunger types was no longer a factor with the Russkit's top mounted resistor.

I adopted the transistor DiFalco adjustable when it first became available and have periodically updated it to the point where I have a very sturdy, reliable unit with adjustable brakes, modulation, and "traction control" all of which I put to good use when racing multiple classes in the course of a meeting.

I do prefer the trigger and index finger but may the Almighty bless all digits regardless of how they're deployed!

[KensRedZed]

Well said, Spiros. 

[Gordon Steadman]

Indeed. Strange just how different we all are. I have always been quicker with the thumb. The best trigger I tried was the Truspeed but try as I might, the stopwatch told me to stick with what my muscle memory, plain damned awkwardness interface told me was quickest.

[Kevan]

At the end of the day the best controller is the one you can get round the track quickest with.