Parallel flute reamers tend to be more prone to chatter in my experience. Helical fluted ones are superior, if only because the location in the bore is better.
If you are talking diameters, Hand reamers taper for a greater length than Machine reamers which have only a short lead.
My preference when holding in the Tailstock is to use a holder which allows the reamer to float. This allows the reamer to follow the hole, and lessens the risk of the Reamer acting as a boring bar to cut oversize.
Howard