We have all of the above, Harley Rake for our Kubota, (2) Power Rakes for our skid steer's and they save allot of time. I would suggest the Harely Rake only because it digs down and rototills the soil while removing the rocks and gives a nice finished look with little to no hand raking. It does take some time to get it right and you have to carefull that you don't changed the grades. The power rake is a nice tool for newly graded loam and will not work if you try and use on an exiting turf, say for a renovation situation. All in all I would stick to the Harely rake, you should be good to go.
"Either your Boatswain Mate or you work for one"