12 months... you are very patient
It could be time well spent comparing and contrasting the various controllers you already have - noting down the 'feel' of them with different cars (and especially different motors) and carefully examining the differences in lap times. That will start dialing in your preferences - thumb /trigger controller; soft or hard spring tension; power coming in quick or more gently; most of the action at the start of the trigger or nearer the end.
I've raced the HO Le Mans 24 hours at Derby ten times (I think) and each year we bring along an esoteric selection of basic resistor controllers for our team to use in practice and the race - different makes, handles, models, ohm-ratings, straight and non-linear wound resistors etc... We're all racing the same car on the same circuit, but the choice of controller is very personal. I have teammates who drive best with controllers that I find undriveable - and vice versa. It's also true that a different controller might be better for the tighter 'gutter' lanes - or when then car's handling changes over the 24 hours (which it does). The rules of the race permit only basic controllers and there is no brake wire, so no dynamic braking (when the motor physically slows the car).
What the basic adjustments on a two-knob electronic controller do is to change how quickly the power comes in (sensitivity) - which isn't unlike changing to a different ohmage of a resistor controller - the other gives you more or less motor braking when you lift off the throttle. What you'll be doing is adjusting the knobs so your controller works as you like it with different motors (eg a Scalextric motor vs a Slot.it Flat 6) and with different types of circuit (eg fast & flowing vs tight & twisty). I like the power coming in only moderately quickly and use very little brake - I like the car to flow. It is very handy to use one adjustable controller to give me exactly the feel I like with different cars on different circuit types - or a very slight adjustment between different lanes.
The more knobs, the more of the characteristics of the controller you can change. In combination, they will be changing the different parts of throttle response 'curve', but might have names like traction control or anti-spin, maximum speed, start speed, acceleration, brake hold etc. Different controllers will do these things differently and have their own quirks to get used to.
Most electronic controllers also have the option of physically increasing or decreasing the spring tension of the trigger - so you can get what suits you best. On a standard Parma or DS (or the Scalextric controllers) it's a case of replacing the spring itself with a softer or harder version.
If you run digital a lot, picking up a Truspeed SSDIII controller will be a revelation after the Scalextric Digital ones. The Truspeed digital controllers are a plug & play replacement, but have the sensitivity and brake knobs which act pretty much the same as on an analogue version. The controller options in RCS64 might make more sense too.
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