FWIW- I use a choke servo and a optical kill ( smart fly ). My engine ( ZDZ50) will not quit at the low throttle stop so I have got to use one of the other options. Both servos are in the engine box and absorb alot of vib and eventually one will fail, or a linkage. You hear about it alot.

I didn't want to take a chance.

I use the optical kill whenever I shut down the engine, as it is the easiest way for me.

I couldnt rig a choke bellcrank on my plane so thats why I used a servo.

The next plane should not need a servo choke so it will just have a smart fly.