Pros/cons of each? Tine rake(JRCO etc) doesn't pull up as much material, but I wonder if there is less soil disturbance? While the flail type power rake really pulls up the thatch but is it harder on the root system? I've used both and own one JRCO(ordering another for the Z), rented the power rake for small gates. What are your experiences with either? Is a power rake desirable for the extra thatch removal, or is a tine-rake style sufficient?