I personally chose the plane angle of the left shoulder (which goes through the thorasic vertebrate) so that I could move my shoulders only. For me this is the simplest stroke. There is nothing wrong with using the clubshaft or elbow as a plane angle either. It is all a choice isn't it. Just make sure it fits the geometry of the circle.
vj: I am a little confused here. Does this mean in your preferred set up you like the putter shaft left forearm and arm on a straight line ? Thanks