I bought a plow and it works great. My next purchase will most likely be a rototiller.
I use a Ford, Series 101, 2-14" Turning Plow.
After plowing, you will likely find an adjustable, box-frame Disc Harrow as effective as a Rototiller, certainly cheaper new or used, mechanically simpler, more tractor fuel efficient and faster over the garden/field. My "kink" is alway, always seeking the simplest solution, and a Disc Harrow is certainly simple. ( Also, the easiest implement to mount on the three point hitch. )
However, if you are going to open a small size garden in unplowed ground, the Rototiller may be better depending on how friable your soil is.
How big an area did you plow? Single bottom plow or a two bottom plow? What kind of soil do you have?
I went through Navy Recruit Training in San Diego in 1965, but during my eleven week San Diego visit I did not have an opportunity to observe soil conditions. The Marines, undergoing Recruit Training on the other side of the fence, seemed to have ample opportunities to check out San Diego soil while digging foxholes.
Others will CERTAINLY have different opinions on Disc Harrow Vs. Rototiller, always a controversial comparison on T-B-N.
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