I'd say depending on your soil and how much weight you can get on that disk, I'd go with the disk first. The plow is great, but once you get a plot established, with a little patience (and who doesn't want more seat time, after all
), a good disking could get your garden plot ready each year. I know this because when I was but a wee lad, we'd put in a garden as a family each year and rather than invest in a plow, we used my grandfathers disk that had been passed down to my father and now me. Anywho, y parents would put me on the ol' Wheel Horse with the disk and a couple cinder blocks and go inside. When dinner time would come around, they'd come out and peel me off the tractor and violla! Perfect garden plot