Thanks for the very interesting test results!
I use/carry both the carbine and rifle length Winchester model 71s in 348.
The 20” carbine is a bit lighter and shorter, making it easier to maneuver through the woods.
I’d give the 24” rifle the nod for a bit better balance and accuracy, but not enough for me to prefer carrying it over the carbine.
Between the two, I’ve never noticed a difference in cycling time for accurate repeat shots, but I’ve never gotten serious about testing one against the other.
I frequently use a model 70 xtr Featherweight (red pad) 30/06 that has an action that is smooth as butter, but it doesn’t compare to the Model 71s for quick, on target repeat shots.