I use whatever works depending on which Transmitter I am using. I love analog trims for throttle. Digital throttle trim is just - IMO - strict garbage. It is made to sound good because the mfgers. make it sound good but simply cuts their expense while making the rank and file think they have the latest "must have." [:@]

I want my throttle lever to come full back at a nice idle, then use the rotary trim for cut-off. For me digital is just not enough "absolute". However I am forced into several of the #@&**% things.
With analog I can work with the various servo arms and throttle arm to get what I want to perfection. With digital, it is for me to never get everything just right.
(flame suit on. )

Another point is that weather, humidity, temperature, fuel type (nitro/oil % ) can mess up an existing idle which everyone blames the engine for.