As far as I know, with all the currently-used ESCs, the brake only works at the lowest setting that you have on your Tx throttle curve,i.e. at the point where the ESC arms.
So setting your idle a few revs above that point,means that all ESC braking is lost,and any braking effect is just prop dependent.
In general, you'll get more prop braking with a bigger diameter,and to a lesser extent with a wider blade, and also with more blades of course.