Different techniques will produce different outcomes for different people. My best length gains have always been from workouts using a few stretches, followed by jelqing, followed by about four hours extending at low tension. Low tension to me means extending at less than my erect length. About an inch less. Stretching at my maximum erect length, or even longer if I can stand it, seemed like it would be the driver of growth when I started PE. I was told to start out with my extender arms set at a length about an inch and a half less than my BPEL. That seemed stupid to me, but I was cool with just learning to put that thing off and on at low tension for that week, as it seemed a bit awkward to me. I didn’t expect to see growth until I was logging hours with it extended way further out. But I got gains. Good gains. So fast when I was a newbie I can hardly believe it now.
My thought or theory about it is this. Stretching and jelqing stretches and expands the penile tissue beyond its current limits, then letting it recover in a just slightly longer than usual flaccid length encourages the best, and quickest growth and recovery. I am of the opinion the penis cannot be forced to grow, but should instead be gently encouraged to do so.
Like I say, different people will have different outcomes from different methods, but workouts followed by just barely extended past flaccid length works best for me.